I am using Xubuntu 11.10 and it is great! Converted to using Linux exclusively about 5 years ago. Started with normal Ubuntu, but changed to Xubuntu when Unity came out. I was amazed how well XFCE worked and how little resources it used. I have never looked back.
I am an Electrical Engineer and have been able to use Linux as my host and VM's to run specialized software that only run on Windows.
I really like XFCE and would like to contribute in some way! I like the ability that XFCE has for customization with native components, such as panels.
I am not sure how to get started in the community though. What is the best way to help?