I'm pickwick at Dreamwidth too. I'm not leaving LJ in the forseeable future - I'll be cross-posting, and one of the main points of Dreamwidth is its interoperability. LJ users can comment on DW posts using your LJ account - it works as an OpenID - but I'll probably be mostly interacting on LJ anyway.
Announcing Dreamwidth Studios by synecdochic
A recent fact-sheet by synecdochic
Dreamwidth and OpenID by azurelunatic
So, who else is on Dreamwidth? And are you cross-posting, or should I be looking out for separate entries on LJ and DW?