Drum solos... noooooooooooooooo! Just, no. Stop it. Except maybe in jazz, and even then keep 'em short.
You probably have the impression that all drum solos involve thrashing about and hitting everything in sight, which to be fair sums up most of them. However, check out some of the links I've posted in the OP, and you may be pleasantly surprised.
Terry Bozzio's drumming to the Black Page is legendary amongst drummers for its sheer complexity, as it involves myriad polyrythyms, and complete independance between all the limbs. The hands and feet actually play in different time signatures to each other, and this is very difficult to do.
Steve Gadd's drum pattern to Fifty Ways to Leave Your Lover is also much copied by aspiring drummers. In fact, Steve Gadd is copied by drummers full stop.
A drum solo, like any musical solo, can be good, bad, self indulgent, musical etc. People readily accept guitar solos, but seem to have a problem with drum solos. Probably because there are so many awful ones about. The good ones however, really stand out.