I'd like to compile a list, for my players, of essential/useful magic items for every class and specific classes. What do you think belongs on the list?

Edit: Wow, a lot of great stuff in this thread. I'll try to compile everything here by price. Finished

Tell me if I missed something.

Ioun Torch
Hands free torch with no slot
All classes
75gp

Sleeves of Many Garments
Disguises and RP while very cheap
All classes
Slot: writs
200gp

Soul Soup
Allows an extra saving throw against mind effecting when washed with it
All classes (Party Item)
200gp

Traveler's Any-Tool
Can become masterwork tools for more most Craft or Proffession skills
Characters with the skills
250gp

Key of Lock Jamming
"Seals a door shut and makes it harder to break down, situational, but useful."
All classes (Party Item)
400gp

Cracked Dusty Rose Prism Ioun Stone
+1 initiative at a cheap price
All classes
500gp

Mask of Stony Demeanor
+10 Bluff to lie and +5 Bluff checks made to feint
All classes
Slot: Head
500gp

Wand of Cure Light Wounds
50 charges of 1d8+1 at lowest
alchemist, bard, cleric, druid, oracle, inquisitor, paladin, ranger, witch
750gp+

Bracers of Armor
Armor bonus for those who can't wear armor
Classes without armor proficiency
1000gp+

Cloak of Resistance
Increases all saves
All classes
1000gp+

Cognizance Crystals
Pearls of Powers for Psionic classes
Psionic classes
1000gp+

Muleback Cords
Strength is 8 higher for carrying capacity
Packmules (Party Item)
Slot: Shoulders
1000gp

Pathfinder Pouch
Great for smuggling and money
All classes (especially typical rogues)
1000gp

Pearl of Power
Prepared Casters get to reuse spells
alchemist, cleric, druid, magus, paladin, ranger, witch, witch
1000gp+

Quick Runner's Shirt
1/day extra move action
All classes (especially physical classes)
Slot: Chest
1000gp

Hat of Disguise
"1,800 gp to be a shapeshifter? Hell yes!"
All classes (especially Rogues)
Slot: Head
1800gp

Scabbard of Vigor
Cheap temperary +1 to +4 enhancement bonus 1/day
Physical attackers
Slot: Belt
1800gp

Amulet of Natural Armor
Stackable AC
Every Class
Slot: Head
2000gp+

Gloves of Reconnaissance
Look through up to 15ft of solid material for 10 rounds/day
Every Class (Party Item)
Slot: Hands
2000gp

Handy Haversack
Move action to retrieve something with no AoO
All classes
2000gp

Ring of Protection
AC Stackable with armor
Every Class
Slot: Ring
2000gp+

Bag of Holding
Loot sacks
All classes (Party Item)
2500gp+

Eyes of the Eagle
+5 to perception
All classes
Slot: eyes
2500gp

Ring of Sustenance
only need to sleep 2 hours
Spellcasters
Slot: Ring
2500gp

Amulet of Mighty Fists
Enhancement bonus of +1 to +5 on attack and damage rolls with unarmed attacks and natural weapons
Monks and Summoner's Eidolon
Slot: Neck
4000gp+

Belt of Mighty Constitution, Incredible Dexterity, Giant Strength
Basically factored into CR
Most Classes
Slot: Belt
4000gp+

Headband of Alluring Charisma, Inspired Wisdom, Vast Intelligence
Basically factored into CR
Most classes
Slot: Headband
4000gp+

Circlet of Persuasion
"What's that? A head slot item that gives you +3 on all charisma based skills? That's not a headband, so it can stack with your headband of Alluring Charisma!? AND it's less than 5000 gold!?!?!?"
"Great for bards, rogues, and other skill monkeys everywhere."
Slot: Head
4500gp

First Aid Gloves
Any class able to use an expendable # of cure spells
All classes
Slot: Hands
4500gp

Blinkback Belt
Basically gives a weapon returning (quickdraw recommended)
Any thrown weapons builds
Slot: Belt
5000gp

Dusty Rose Prism Ioun Stone
+1 Insight bonus to AC
All classes
5000gp

Insistent Doorknocker
Creates a door through up to 1ft of wall ceiling or floor
All classes (Party Item)
5000gp

Jingasa of the Fortunate Soldier
+1 Luck bonus to AC and negation of crits or sneak atk 1/day. Great with Fate's Favored
All classes
5000gp

Boots of Striding and Springing
Speed increase by 10ft, +5 bonus to jump checks
All classes
Slot: Feet
5500gp

Boots of speed
10 rounds of haste/day
Any class/build that uses a "natural or manufactured weapon"
Slot: Feet
6000gp

Eidolon Anchoring Harness
Trade summon monster ability to keep Eidolon out after you're unconscious
Summoner
Slot: Eidolon's Body
6000gp

Gloves of Elvenkind
+5 spellcraft +5 concentration checks
Spellcasters
Slot: Hands
7500gp

Snakeskin Tunic
+1 armor bonus to AC, +2 Dex bonus, +2 bonus against poison
Classes without armor proficiency
Slot: Chest
8000gp

Strand Prayer Beads, Lesser
Can cast bless and cure/remove spells 1/day
wizard, barbarian, fighter, rogue, monk, magus, summoner
9600gp

Lyre of Building
Builds buildings, tunnels, and ditches at incredible speeds
Maximized usage when used by someone with Perform (strings) (Party Item)
13000gp

Scabbard of Keen Edges
Keen Weapon 3/day
Physical attackers
16000gp

Carpet of Flying
Unlimited overland flight
All classes
20000gp+

Portable Hole Portable (and foldable) storage you can slap on the ground (probably also has some utility purposes)
All classes (Party Item)
20000gp+

Ring of Freedom of Movement
No hold spells, no slow, now web, and act normally in water
All classes
Slot: Ring
20000gp

Celestial Armor
+3 chainmail, counts as light armor, and can cast fly 1/day
Classes/builds with Light armor proficiency
22400gp

Cloak of Displacement, Minor
Constant 20% miss chance
All classes
24000gp

Metamagic Rod, Quicken
Quicken 3rd level or lower spells 3/day
All spellcasters
35000gp

Strand of Prayer Beads
Cast spells at +4 caster level, plus some smity stuff
cleric, druid, Inquisitor, Oracle, Paladin, Ranger
45800gp

Ring of Regeneration
Fast Healing 1, immune to bleed, and regenerate limbs? Hello Piccolo ring
Every Class
Slot: Ring
90000gp