This forum is packed full of the stuff, and it's nice to see when people actually put the creations to use. So, what do you use? If possible, provide a link so other people can check it out if available.

As for me, I like Ziegander's Diablo 2 Paladin Aura's, which nicely compliment Ernir's Diablo 2 Monster Templates. Adding those templates is so much easier for upping challenges on the fly.

I always love any Warlock-based homebrew, but Pramxnim's Geomancer takes the cake for me. Sure, it could use more invocations, just like the Warlock, but I love the flavor of this class. I like the Time Mage, too, but mostly for nostalgia, as it was the first piece of homebrew a friend used in our first campaign... Long before we knew what we were doing

Mephibosheth posted a Hexblade revision, but I especially like the spell-less variant.

Unrelated to 3.5, I'm a huge fan of Kensen's Rogue: Clandestine Operations.