There are no items that boost Identify, other than the book that Fergus drops which teaches it to level 2. The weapons officer in the drill grounds of act 1 and the smith in the temple of act 3 teach Identify to level 5, while Brian in the BF of acts 4 and 5 (after-game BF) teaches it to level 10 and 20, respectively.
In DD I had a collection of equipment with handy skill bonuses (Identify, Repair, etc) that I would occasionally use, but not in BD. In both cases I had plenty of spare skill points, but you could always have a BF merchant identify stuff for you, if you can't or don't want to add points to that skill.
