I can’t believe that I’ve never come across these guys before on my neverending quest for free amazing fonts.
The Lost Type Co-op has an amazing collection of free, high-quality (mostly) decorative fonts.

Some of my favorite free fonts, all of these are from FontSquirrel and ready for @font-face implementation at the drop of a hat! Bam!
Megalopolis Extra
I love the ligature opportunities with this guy. God bless OpenType!
Chunk Five
Probably my favorite all-time (maybe?) slab. Perfectly in-your-face!
Quicksand
Love the light, airy feel—plus the swashed ‘Q.’ Look out for the gorgeous dashed version. So easy to use in so many designs! The bold and bold-oblique versions were kind of an afterthought, but this dude shouldn’t be used in excess anyway.
Museo Slab
Museo is certainly growing in popularity within the design community, but I’m a fan of it’s slabbed version. Because I like slabs. Sue me.
St. Marie
I literally just noticed this guy now, but I love the thin slab! This is an elegant combination of Archer and Caecilia—both are some of my faves.