Dell Outlet have just posted a bundle (about 20) of these on the outlet site.
They're £343.11 before the £100 discount but you then have to add VAT and then P+P and it works out at £296. A good price for a Core 2 Duo machine.
T5800 Core 2 Duo 2GHz
15.4" LCD with LED backlight Truelife
Intel Integrated GMA 4500MHD graphics which is respectable.
They are Vista Home Basic mind.