hey. i think we should use this thread to add (list...make an ongoing list) of apps that work with the iphone simulator... because that seems to be a hot topic around the 'net and on macrumors/mac forums..
Allmost all apps that don't require device specific features should run in the Simulator, as long as the dev sends you their Simulator Library Application Support directory containing the intel-compiled Simulator app bundles.
Of course arm apps won't run on the sim (e.g. anything that runs on the device except web sites).