Looking back in my e-mail archives, it looks like I first signed up for Lijit back in June of 2007. If I remember correctly, I think I implemented it, but later, it got pulled in some blog redesign. This time, it's likely here to stay. On May 16, I undoubtedly polluted the Lijit user database, signing up again and getting a second account. Oops.
Search results from Lijit are displayed as a pop-in window in the Web browser, not asking you to leave the site, but instead, showing you the results, surrounded by Google AdSense. Of interest, Duncan Riley said on FriendFeed yesterday that not sharing the revenue with the bloggers themselves was "not cool", but I hadn't given that much thought before implementing.
The most visible benefit of using Lijit is showing site visitors what the most popular searches are, either on my blog, or used to find the blog. As of today, the top ten terms are: FriendFeed, Twitter, Blogger, Lijit, Techmeme, BlogRize, MyBlogLog, ReadBurner, FriendFeed to Watch and Duncan Riley.
Also very helpful is the ability to filter what is displayed. I've mentioned before that there's a core element of Web perverts who like some pages in my archives, so I get all sorts of odd traffic from dirty keywords, which I don't want shown, so I can hop into my Lijit page and add these unwanted terms to the filter.
So it works. Good stuff. And while I underplayed Lijit's integration with other services like MyBlogLog, Del.ico.us, Flickr, Reddit, StumbleUpon, Disqus, Digg, YouTube, etc., this element may become more important in the future, as site visitors can do more than search just my blog, but they can search all across my network, essentially acting like FriendFeed in reverse, not looking for one site to track my activity, but instead a search point to analyze all my activity around the Web. I'll be watching this to grow over time, and hope to report back and say if site visitors are doing more than searching my blog, but searching my content as well. I've enabled a dozen different sites to pull from, so have at it.