Apple Gazette points out that Adium’s publicly visible stats page, which lists hardware & OS info from Adium’s software updater, lists a machine identified as “MacbookAir”. I also noticed several other interesting machines there, like non-Apple PCs and several ADPs (Apple Developer Platform, the old Intel transition kit which was supposed to be returned to Apple long ago).

Adium - Sparkle  Information
Uploaded with plasq’s Skitch!
Adium - Sparkle  Information
Uploaded with plasq’s Skitch!