I agree. Have you ever tried to spell stackexchange.com on the phone - maybe even to a non-english speaker? Oh boy. It's not a great name, and some of the alternatives should be within reach for a company that started with $28M of venture capital.
However, there doesn't seem to be much interest on SE's end to do anything about the domain name - not even the stackexchange.com umbrella. The only official response I've ever received to some suggestions I made (that weren't that terrible IMO, at least worth a look - se.com was among them) was a sarcastic comment from Jeff about the "shit's easy syndrome" with no explanation.
Still, the one domain name I would favour is stack.com - but it's in active use, so it's probably not realistic. stack.org is in use for personal E-Mail addresses only - maybe worth a look?