No, they don't. Many recent buyers of computers will have more pixels than this. However, the vast majority of computers in the installed base have been in use for years. The pixel count of a substantial fraction of their monitors don't even approach the pixel count of the iPad.
This is 2010, not 2000. While I would agree that quite some people might still have 1024 x 768 screens, you can not be serious with your "doesn't even come close to that resolution" comment. Many websites haven't even been optimized for anything smaller than 1024 x 768 for years. Either you are talking about mobile phones and not desktops, or you just woke up from the 90ies.