I don't believe that "personalised" websites are going to fly, for the simple reason that Computers Are Stupid. Even Google's ads - which are fairly well targeted and backed by an enormous database - are very much hit and miss. If they can't even get my gender and country of residence right more than half the time, I don't see them as sufficiently reliable to run a serious website.

Additionally, you'll have to have a "default" website anyway, that you can display to "virgin" users - that is, users about whom you have insufficient records to generate a custom site (the only identification you get, after all, is an IP - and they change every once in a while).

- Jake

If you only spend 20 minutes of the rest of your life on economics, go spend them here.