Better late than never.
I have just become enlightened to Da Ali G show and now wish I had watched the first season on HBO last year. It is the funniest thing I have watched since The Office. The satire runs high, and the comedy is low brow, but it manages to be a riot all the way through. The second season is currently showing on HBO on Sunday nights and has premiered two episodes so far. Make sure you check it out, or it you are uber l337 download it off of bittorrent.
p.s. the special “Before he was Massiv” shows Ali G’s climb to fame in England.