I just purchased some stash for my next few projects, which included some beautiful threads. I just love all those colors! Beyond the all-important DMC (and Anchor), there lies a fabulous and drool-inducing world of threads to enhance your every project. If you're new to cross stitch, or haven't yet looked beyond DMC/Anchor, you'll be thrilled with what's out there (just remember that overdyed threads are generally not guaranteed to be color fast). Some of the many threads worth exploring:
Weeks Dye Works - located in my neck of the woods, awesome!
The Gentle Art - Sampler Threads
The CARON Collection