Still running my 8500 after god knows how long, it's served me so well - has been all over the world with me and kept me entertained watching dvds, and has earned me a living doing freelance work for a long time now as well....in the time i've had it i've had to do a few things to it to keep it alive:
New GFX Card (ATi 9600 M10) With copper cooling mod
New keyboard - glass of wine took care of the old one
Zalman notebook cooler.
I think thats about it...
Still very reliable, and still working just fine for all my development work - at the moment it's running office 2007, sql server 2005, visual studio 2005, visual studio 6, and i use it for playing cs source sometimes too...It runs all these apps just fine - I continue to be amazed. I even installed Vista on a spare hdd a couple of weeks ago - and it runs that ok as well.
I was on the verge of ordering an xps m1710 last week - then looked at old faithful on the desk, and couldn't see the point of spending 2K plus at all, its been the best machine of all I've ever bought or built, and i'm sticking with it