So, About This “Twitter” Thing…

If I were to start using Twitter, what’s the best way to go about that? That is, what interface to the service makes it the least annoying to use?

It would be a nice bonus if the package in question could handle multiple accounts, too. I will probably sign up as myself to try things out, but the real point will be to create a Twitter account for the dog, for book promotion purposes. It’d be nice to be able to post things from either account without having to switch programs.

(That’s not a deal-breaker, but it would be nice…)