Daypop, a cool site that a bills itself as a "current events search engine" has a Top 40 for blog topics. It's a great way to see what bloggers are blogging about right now. It's like a Buzz Index for blogs.
Check it out: http://www.daypop.com/top/
Then for a lark check out the most popular wishlist items on Amazon.com: http://www.daypop.com/wishlist/ Useful? not really. But hey, if you're having trouble thinking of a gift for that certain someone, maybe this will spark an idea.