developerWorks article - Going wild with generics (Understanding wildcard capture)
Although being a little hairy this article is quite interesting if you're doing stuff with generics in Java.
Java theory and practice: Going wild with generics - Understanding wildcard capture
Update: I can really recommend the Sun tutorial on Generics if you want to get up to speed on Generics.
SWT @ Notes 8: Why OSGi is important
I have posted stuff on the OSGi console previously and why it's important but even better is to see for your self. I did this myself by adding TwitNotes console commands to the TwitNotes plugin for version 1.0.4. For the normal user it wont matter but it actually proves to be very useful for troubleshooting and something I will definitely add to the other sidebar projects I'm working on.
For more info and code example see the post "Extending the OSGI Console" by Bob Balfe.