What 3rd party material has good collections of magic items?
I'm mostly looking for low level magic items, I'm doing an E6 campaign, and so I'm trying to find things that would work well in low levels, but provide a lot of flavor.
I like the "Loot 4 Less" series by Owen K.C. Stephens, a lot of which I'm inserting into a couple E6 settings.
Current edition is Pathfinder, but might be worth looking into for low-power magic items; I don't know if the 3.5e version is still available.
For the 3.5e version, the focus is on items priced under 2500gp. It has a few interesting mechanics bits as well (alternate staffs, +1/2 enhancements, and so on).
I use the treasure generator in the back of Draconomicon but the very best that I HIGHLY recommend is the Mother of All Treasure Tables from Kenzer. It's awesome!
Treasure descriptions by the thousands and if you mix and match the results are limitless.
I've found so many interesting ideas from the treasure descriptions.