@Jimbo45
"People aren't going to re-install an OS on a brand new computer."
I'm sorry Jimbo45 but what does that even mean? Tons of people (myself included) have installed old OS's on brand new computers... The number of people who bought brand new computers (which came pre-loaded with Vista) and "downgraded" from Vista to XP when Vista was first released was staggering.. not to mention the number of people that are STILL doing that with pre-loaded vista machines... so I really don't know what you mean by that statement....
If you mean that someone who goes out and buys a brand new computer that was pre-loaded with Windows Vista, for example, isn't going to take it home and re-install Vista than I'm sorry but I don't agree with you at all on that.. Have you ever bought a brand new computer with an OS already loaded on it? There ALWAYS loaded with so much bloatware that the computer barely works like it was brand new.. it works more like it was already a year old in most cases.. I bought a laptop 4 months ago that already had Vista on it and the first thing I did with it was reinstall Vista so that I could actually have a NEW computer that wasn't so full of bloatware that it worked like complete garbage.... and so I could have everything setup the way I wanted it seeing as it's MY laptop I'd rather setup the OS to my liking right from the start... but I guess... maybe that's just me too...

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(NOT AT ANYONE SPECIFIC)
As for keeping Windows Xp around longer....
I for one don't care if XP is supported/still avaliable until 2014 or 2050 to be honest... it's already a decade old.. it's time to move on already.. I admit it may be a good choice for netbooks and people that aren't very technologically inclined.. but still, XP has had it's 10 years of fame, hahahaha.. let's put it to rest and just move on..

I admit I will still use it after the final version of Win 7 is out but it definitely won't be my primary OS anymore.. In fact it hasn't been my primary OS since December 07.. I purchased a full retail version of Windows Vista in Dec 07 and have used that as my primary OS ever since.. And with the release of Windows 7 build 6801 I made the switch to that as my main OS...

(Note that is not what I would suggest doing in any way.. that's just what I did. I am comfortable enough with computers in general and with Beta software to know the risks involved with doing something like that so no worries there..) and as I've stated in a couple other posts, since build 6801 MS has continued to impress me with Win 7 and hasn't given me any reason to want to go back to XP or Vista as my main OS... so unless they royally fu*k Windows 7 between now and the RTM I honestly don't think I'll EVER go back to XP or Vista as my main OS..

But hey, that's just me..
I'm not trying to get anyone all riled up here, just stating my opinion on the whole 'Keeping XP around for another 5 - 10 years' thing.. I just don't see any valid reason for doing so... and yes I've heard plenty of arguments as to why they SHOULD keep it around longer.. but I still don't agree.. I for one will pay whatever pricetag Microsoft slaps onto Windows 7.. I'm sure I'm not alone on that either..