I've been merrily using Rational Software Architect these past few weeks to capture models uncovered in my archeological digs for the Handbook. Speaking of rational architects, check out what this site has to say about the mindset of the architect.
BTW, why anyone would willing want to eat dog food, whether it's their own or not, has always disturbed me. This is a meme that seems to have been given life inside Microsoft some years ago and then propogated by the dot bomb, er, com, crowd in the 90s. May that phrase rest in piece, along with all the other detritus of the 90's tulipmania.