I've just finished migrating my web site over from Site5 to Dreamhost.  I've been very happy with Site5, but Dreamhost has a nicer control panel (IMHO) and has, as far as I can tell, much better Ruby on Rails support -- they support Passenger, which makes deploying Rails applications a lot easier.

If you're seeing this post, then you're seeing my blog in its new home.  Be sure to subscribe to the updated feed!  :)