Thanks for your advice guys.

Had a client recently we designed a site for based on 800x600, they looked at the design in the office on pc and mac and in varying screen resolutions - happy with everything. Had a phone call at the end of the day - not as happy a customer - site obviously viewed on a very high res monitor - we ended up modifying to 900px width with repeat-x image/colour to fill the screen like aso186 mentioned, it did looked stretched - or more wide screen!

mwdesign