Misc. Search Sites:

    http://www.spokeo.com
    http://www.pipl.com
    http://www.peekyou.com/
    http://www.ipeople.com
    http://www.yasni.com
    http://www.skipease.com
    http://www.peekyou.com
    http://www.soople.com
    http://Abika.com
    http://freeality.com
    http://radaris.com
    http://wink.com/
    http://www.isearch.com/
    http://www.keotag.com/
    http://yahoo.intelius.com/
    http://www.findermind.com/free-people-search-engines/
    http://www.192.com/ (UK)

WhitePages Search:

    http://www.whitepages.com
    http://www.zabasearch.com/

Archives Search:

    http://aad.archives.gov/aad/series-list.jsp?cat=GS29
    http://www.archive.org/web/web.php

Social Network Searches:

    http://www.facebook.com/directory/people/
    http://topsy.com/
    http://monitter.com/ (Monitor twitter convos)
    http://socialmention.com/
    http://knowem.com/
    http://twoogel.com/
    http://www.yacktrack.com
    http://www.samepoint.com/
    http://www.whostalkin.com/

Phone Information & Lookups:

    http://www.freecellphonedirectorylookup.com
    http://www.numberway.com/
    http://www.fonefinder.net

Public & Criminal Records Search:

    http://publicrecords.onlinesearches.com
    http://www.jailbase.com/en/sources/fl-lcso/

IP Address:

    http://whatstheirip.com
    http://getthierip.com

Website:
    http://who.is

*Please note some sites may be country specific
-----------------------------------------