Like it or not, till today, the best desktop OS and user friendliest OS are Mac OSX and Windows (Oh yeah, Vista is a resources hog and a "copycat" of OSX but it is indeed a big leap in windows world and no...technically it is totally different to OSX (speak about .NET3.0, DX 10, etc)...and yes upcomming OSX Leopard will "copy" the Vista theme all-black Aero-like...now say who copies who
) ). Anyway, I dont wat to start a religious war or trolls
For Linux, in my opinion just Novell Linux Desktop 10 is acceptable for end-users. If you want the opensource one than you should look at the SUSE 10.x.
Speaking about Linux and about Hobby OS. You should look at SkyOS ( http://www.skyos.org
) and you will think Linux is developed too slow and get bloated. (--> dont get me wrong...I dont want start a troll and I do use Linux from day-to-day basis