This is a project I've been thinking about for a while, and I'd love to do a hack weekend to get this working sometime.
If you haven't noticed the lovely Lijit search wijit on the left sidebar here, please leave your feed reader and come check it out. This is a very interesting concept to me - they're taking the Google Personalized Search tools and providing a very user-friendly (and statistical) interface to the tool. A mash-up with a business model? Amazing. I've also read on their blog that they're going to start tracking comments on your sites as well and I suppose integrating that with the other statistics and search metrics you're already getting. Good times.
UPDATE: the apple.com logo is now 152x152, they have scaled up some in the intervening years.