Watch out for Share Point Services
Whilst installing BizTalk Server today I ran into a strange thing.
Share Point Services 2.0 does have two builds (August 29th - 34,733 KB and November 30th - 34,730 KB) with the same version number (6.0.2600.0000).
So be warned: if you need to install BizTalk download every piece of software again and don't rely on version numbers.