I'm not sure if size matters, but if it does, Martin's laying claim to the World's Smallest TFS as compared to Dave Glover's system.   Wonder if anyone can beat that?  It also makes me wonder who's got the largest...I'm thinking it might be our own internal installation with multiple servers for the AT, DT and Analysis Services as well as tons of SAN drives.  But then again, maybe size doesn't really matter.  I guess it's up to you to decide.