I've got a Dell (shock! horror!).

Inspiron 9400 with
T2600@2.16GHz (Dual core)
2.00Gb RAM
GeForce Go 7800 256Mb
The HD is small at 80Gb, but it is 7200rpm
17 inch widescreen

It works well enough for me (though, of course, I'd always like something better - who wouldn't?) It's quite chunky, but I don't mind that - I can get it on a 'plane or 'round the country, I'm happy.