CFEclipse 1.3.1.5 was recently released and it works with Eclipse 3.3 (Europa). It seems that some of the people using it can't seem to get the line number feature to work.

It looks like in order to get line numbers working properly, you will need to go to Window->Preferences->CFEclipse->Editor and check off "Show line numbers". The little menu that comes up when clicking on the gutter in the editor doesn't seem to work, and I'm guessing that Mark Drew just forgot to override/implement that menu in CFEclipse for 3.3. Hopefully he will fix it soon.