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.