@rhin0x: We've talked on and off about Vista's kernel throughout the episodes. Of note, WDF, ETW and UAC were all added in Vista (nearly everything you can think of as being awesome was introduced in Vista).
Mark Russinovich did this really popular video on Win7, that should be watched.
@vjabran: Most of the T-shirt I wear are either from the Microsoft Company store on the Redmond campus (not to be confused with the Microsoft Stores in malls), or are internal T-shirts from product launches, etc.. Looks like you need to visit HQ. :)