Based on my experice in open source developing, I had a lot of fun for doing it. Also I'd like to address some improtant comments when we are working on open source.

* Documentation. : Any code we wrote should be documentated. It's very important for you to check back and for the people who want to contrubute to it.This is really important in open source community. Because I couldn't find the documentation for the Bookmarks services, I cannot make the bookmark unit testing work.* You need to get help from the others, but don't wait. : I had sent email to ask help for my problems, and I never get response. Especially in open source community, we do need help from the others, but don't relay on them.