XPages are a new feature in Lotus Domino 8.5 that allow you to do things you never thought possible with Domino web development. As it’s a brand new feature, you may not know much about it unless you’ve seen some of the presentations at Lotusphere.
Well my co-worker and friend, Declan Lynch has been writing a series of blog entries going through all the basics of working in XPages. He is currently at post 33 1/3 (turtee tree and a turd) and the series is an awesome resource. If you want to learn XPages, this is a great place to start!