Milli (from Milli Und Vanilli)
Chris Martin von ze band Caltspiel
Ze rapper Funfzig Pfennig
There's also a twitter account @brunovassup
I'm expecting all sorts of great stuff from both the movie and the marketing. Borat had what is still the single most engaging use of MySpace that I've seen - a fan would post a comment on Borat's wall and then 'he' would post back on theirs, usually something totally inappropriate. See the screen grabs below to see what I mean.
Megan writes on Borat's wall
Borat writes on Megan's wall