With Tomb of Terrors coming, I'd recommend more Rogue related items (but not exclusive to rogue):
Viper related items (counting as part of the viper set)
Viper's cowl - head slot - AC and Save Bonus
Dripping Viper's Gloves - hands - Grants a +3 additional poison damage bonus to Viper weapons
+2 Viper's Bow or hand-crossbow
Tome of Painful Vigilance - character can take 20 damage to get an additional hint on a puzzle (usable once per run)
Phylactery of Pain - If user is reduced to 0 hp, it causes 50 retribution damage to target but the user immediately dies (cannot be stopped by Paladin ability but can be raised)
Ioun Stone of Retribution - attacks against the user result in 5 points of retribution damage (psychic)
Shield of Nobility - +3 shield - User may choose to take all the damage of any effect in a room (excepting the final room's failure damage) that could effect all players. That player only receives half that damage of what the group, in total, would have gotten (so if 10 points of damage per character with 10 characters is done, the user would take 1/2 of 100 damage = 50 damage). Paladin's can't share this damage with user to mitigate it. Not usable by Barbarians or Bards (or non-shield users).
Bead of Twisted Luck - User sacrifices 20 hp from their maximum at the start of a run for +3 on all saves and +3 on initiative. That damage cannot be healed.
Crocs of all Lands - foot slot - User takes no damage or suffers any penalty from any environmental condition. -5 to Chr (they are Crocs after all).
PLEASE NO MORE SLOT ENHANCERS!!! Re-printing the old ones is fine but we already have a serious power creep problem. Make the best items competitive for the same slots (like the legendary themes moving to necklace slots). More Ioun stones, more rings, more boots, more shields, more charms, etc are all fine. Don't do amazing items for shins, torso, bracers, headslot, earcuffs, eyes, etc.. Force us to choose what we give up to get the cool new item if we're already at the top of the power curve!
I also like the idea of taking some of the unslotted items and giving them slots. Next year's Tome slot is a good example. I'd add horn to that slot list as well.
Fred