Russ has posted a nice introduction to LifeBlogger.
This was my first foray into the world of the Thinlet API.
It takes a little bit getting up to speed with the XML-based UI design approach, but once you're going, you're going fast.
I liked it so much that I've already started using it for other projects.
In case you wondered... No, I do not have a 7610 to play with. Although after reading Russ's review, I might just get one.
You can use the PC version of Nokia Lifeblog without a phone. It actually makes for a nice media repository.