Filippo was asking on the JUG Milano ML which will be the buzzwords for the next years, the thread of the discussion is here, in italian, but you can easyly find the buzz on it 
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Well, in my post I wrote these:
- JDK 5
- Annotations
- Continuations
- JSP 2.0
- TestNG
- Wicket web framework
- Stripes web framework
- Selenium
JDK 5, or even 6 but I still don’t see so much projects using the 5, maybe in TW will be different we’ll see. With JDK 5 of course annotations.
I was already posting here something about Continuations, I repeat, the work that Greg Wilkins is doing with Jetty 6 is amazing. That app server is already better than tomcat and it’s growing in the better way.
TestNG is the next generation of JUnit. I’m not sure if it will be really the next generation of Junit, but this project is interesting, you should have a look to the discussions about what was moving the author to develop it, quite intersting!
And then 2 web framewors, will be difficult to fight against WebWork+Struts2 or whatever they call it, btw these 2 projects are nice.
Stripes has as main goal to be easy, we’ll see, I’ll try it out 
Wicket should be again very easy to use and u can do all with only editing .java files and html files…
The good thing is that from that post maybe I’ll start a collaboration with javajournal an italian blog and montly newspaper, it’s good: I’ll be forced to write something in Italian there and to try it out this buzz , I’m sure that I’ll put also an english version here. Stay tuned.