Animated Live Search // Ordered List by Steve Smith
Excellent tutorial on adding a live search on a WordPress Blog.
Steve Smith uses prototype and scriptaculous to make things as easy as possible to put together. He also does an excellent job of walking through the process for developers at any level. As he mentions this is Word Press specific but a conversion to other blogging platforms should reasonable.
Link : HOWTO: Animated Live Search // Ordered List // We Make The Web Beautifully Simple