Thanks Simon. I've been looking at the following but will compare with yours:

http://www.viewsoniceurope.com/UK/Pr...60wm.htm#Specs

http://accessories.dell.com/sna/prod...p&sku=320-7339

http://www5.pc.ibm.com/uk/products.n...pi=web_express

The Viewsonic one is the only one of the 3 which includes support for Mac in the spec, not that this appears to count for much.

Ross