Note these are just ones that I myself could find. If you can find more 100% proven lies (after Aug 1 '10) post here I'll edit the list. 

Selective editing to make union proestors look violent. 
http://tpmdc.talkingpointsmemo.com/2011/03/fox-buses-in-footage-from-sacramento-to-make-union-protesters-look-violent-video.php?ref=fpblg

Ron Paul CPAC lie:
http://www.youtube.com/watch?v=lwo0Iyrh1Zk&feature=player_embedded

O'Reilly and Ingraham lying about Planned Parenthood
http://www.newshounds.us/2011/02/18/bill_oreilly_laura_ingraham_continue_to_lie_about_planned_parenthood.php

PolitiFact's Lie of the Year: 'A government takeover of health care' http://www.politifact.com/truth-o-meter/article/2010/dec/16/lie-year-government-takeover-health-care/

Glenn Beck says Muslim Brotherhood wants to declare war on Israel:
http://www.politifact.com/truth-o-meter/statements/2011/feb/15/glenn-beck/glenn-beck-says-muslim-brotherhood-wants-declare-w/

Karl Rove says that “American troops have never been under the formal control of another nation” 
http://www.politifact.com/truth-o-meter/statements/2011/mar/29/karl-rove/karl-rove-says-american-troops-have-never-been-und/

'Fox and Friends' host says Gov. Rick Scott's approval numbers are up http://www.politifact.com/florida/statements/2011/apr/15/brian-kilmeade/fox-and-friends-host-says-gov-rick-scotts-approval/

Laura Ingraham says Massachusetts health plan is "wildly unpopular" http://www.politifact.com/truth-o-meter/statements/2011/may/16/laura-ingraham/laura-ingraham-says-massachusetts-health-plan-wild/

Sarah Palin says Obama has accumulated more debt than previous 43 presidents combined
http://www.politifact.com/truth-o-meter/statements/2011/jun/01/sarah-palin/sarah-palin-says-obama-has-accumulated-more-debt-p/

Palin claims loss of oil production in Gulf of Mexico will cost $8 billion a day in imports
http://www.politifact.com/truth-o-meter/statements/2011/jun/03/sarah-palin/palin-claims-loss-gulf-oil-production-gulf-will-co/

Sarah Palin said Democrats are planning "the largest tax increase in U.S. history"
http://www.politifact.com/truth-o-meter/statements/2010/aug/04/sarah-palin/sarah-palin-said-democrats-planning-largest-tax/

Palin claims Gulf of Mexico drilling moratorium will cause projected 150,000 barrel a day production drop
http://www.politifact.com/truth-o-meter/statements/2011/jun/03/sarah-palin/palin-claims-gulf-oil-drilling-moratorium-responsi/

Glenn Beck says First Lady Michelle Obama has 43 on her staff while Nancy Reagan had just 3
http://www.politifact.com/truth-o-meter/statements/2011/mar/04/glenn-beck/glenn-beck-says-first-lady-michelle-obama-has-43-h/

Glenn Beck paints beleaguered Wilmington, Ohio, as real life Bedford Falls
http://www.politifact.com/ohio/statements/2010/dec/03/glenn-beck/glenn-beck-paints-beleaguered-wilmington-ohio-real/

Bill O'Reilly Lies to Bill Maher on Fox News Misreporting Cost of Obama Trip to India
http://www.youtube.com/watch?v=Yn7_8QL2weQ

Fox not fact checking sources and posting stories from satirical site TheOnion.com
http://www.thewrap.com/tv/article/fox-news-site-posts-satiricial-onion-obama-story-amid-real-news-22840

Nothing politically oriented, but yet another example of reporting false news without fact checking 
http://www.youtube.com/watch?v=z80kwrtCefY&feature=player_embedded

Yet another "story" turning out to be fake that Fox reports as truth 
http://www.cnn.com/video/?/video/offbeat/2010/10/05/moos.jetpack.makes.news.cnn

Busted for fake reports of being attacked at Wisonsin protests.
http://www.youtube.com/watch?v=uM20dEc_Y_Y&feature=feedf

Claims they were used by Gadafi as human shoelds, turns out they never left their hotel room.
http://www.cnn.com/video/?/video/world/2011/03/21/tsr.robertson.libya.fox.claims.cnn?hpt=C2

FOX Anchor Lies About Bush's Linking of Al Qaeda and Iraq
http://www.liveleak.com/view?i=9be_1218211615

Megyn Kelly spins poll
http://www.newscorpse.com/ncWP/?p=2306

Another non political lie: Wallace Inflates Fox News Sunday Ratings
http://www.newshounds.us/2011/03/27/wallace_inflates_fox_news_sunday_ratings.php

Blatantly twisting Weiner's words on health care waivers
http://www.youtube.com/watch?v=LSaXTF9aKzA

Top Fox exec admits lying on air about Obama
http://www.youtube.com/watch?v=Zg4qWPkOpfY&feature=player_embedded

Fox News Chief, Roger Ailes, Urged Employee to Lie, Records Show
http://www.nytimes.com/2011/02/25/nyregion/25roger-ailes.html?_r=1&hpw

Remember the big stink last eyar about the Foxgate climate change emails? "Disinformers defend Foxgate email saying unequivocal warming of the climate should always be disputed"
http://thinkprogress.org/romm/2010/12/16/207207/wattsupwiththat-foxgate-email-unequivocal-warming-of-the-climate/

Five separate lies (not previously listed by myself here) within 4 minutes of video out of the mouth of various Fox news talking heads. 
http://www.youtube.com/watch?v=VFTLleDR--Q

Three other lies exposed in one video that havent been listed here yet.
http://www.youtube.com/watch?v=0lJIWl6Nf30

Fox & Friends Newest Lie: ACORN Getting Federal Funds
http://www.newshounds.us/2011/07/10/fox_friends_newest_lie_acorn_getting_federal_funds.php

Strike this one from the offical count because it's before August '10, but had to toss it in here. Take your pick here of news sources detailing the Acorn pimp video scandal stuff that was selectively edited, and who the creator went to jail for, and which Fox never fact checked http://bit.ly/pGCXuf

Also strike this one from my official count here because its old, but still begs to be mentioned. Fox argued in court it's their constitutional right to report liesif they so choose over the whole debacle with the Monsanto milk drug scandal http://blogs.e-rockford.com/applesauce/2009/10/24/six-years-ago-fox-news-successfully-argued-in-court-that-it-had-a-constitutional-right-to-report-lies/

Theres many more i didn't post because they went beyond the August '10 start point. There's a whole lot more though.

I don't understand why anyone would put any integrity into a network where its president (Ailes) would urge an employee to lie in a partisan attempt to protect Giuliani's campaign, and now recently we see all this nonsense coming out about the hacking scandals.

PS. Watch this film http://www.rottentomatoes.com/m/outfoxed/