I'm a big fan of soma's threaded to threadless adapter (have bought 2 of them). Some don't like the looks or the weight because it's the longest you'll find, but I like raising my bars way up (could be my frame's just too small). The adapter at VeloOrange is rather pretty.
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Bikes: 1996 Eddy Merckx Titanium EX, 1989/90 Colnago Super(issimo?) Piu(?), 1990 Concorde Aquila(hit by car while riding), others in build queue "when I get the time"