Note: The following tier placements aren't complete. They're based on what I read (and still somewhat remember) here at BG and other boards, and also on my own estimates after just skimming the class descriptions, but aren't supported by any actual experience, playtesting or analysis on my part. I'm more of a chronicler, something like Gr1lledcheese's "Why each class is in its tier". Any suggestions, opinions or comments are absolutely welcome.
I hope that this PF tier system will grow and become at least half as widely know and respected as JaronK's work.
(Classes in italics are non-converted 3.5 classes evaluated under PF rules.
Classes in blue are high in their tier. Classes in red are low in their tier.)
P.S. I'm working under the assumption that 3.5 material is allowed and converted, so it's more a 3.P tier system, then just PF.
Tier 1: Wizard, Cleric, Druid, Witch; Archivist, Erudite (Spell to Power Variant)
Tier 2: Sorcerer, Psion, Summoner, Oracle; Favored Soul, Binder (with access to online vestiges), Eurdite (No Spell to Power)
Tier 3: Bard, Rogue, Psychic Warrior, Alchemist, Inquisitor, Magus, Wilder; Swordsage, Warblade, Crusader, Beguiler, Dread Necromancer, Binder (without access to the summon monster vestige), Wildshape Variant Ranger, Duskblade, Factotum
Tier 4: Gunslinger, Ninja, Barbarian, Ranger, Paladin, Soulknife; Warlock, Warmage, Scout, Hexblade, Adept, Spellthief, Marshal, Fighter (Zhentarim Variant)
Tier 5: Fighter, Monk, Expert, Cavalier, Samurai; CA Ninja, Healer, Swashbuckler, Rokugan Ninja, OA Samurai, Knight, CW Samurai (with Imperious Command available)
Tier 6: Aristocrat, Warrior, Commoner; CW Samurai (without Imperious Command available)