Personally I think resume's are loads of crap and I do my best to avoid giving them out. I find it a much better strategy to talk about what problems a manager is facing and how my joining the team will help resolve those problems.

To answer your question though...

Try to quantify what kind of impact your work had to either the top or bottom line and avoid talking down the team or technology used.

Barring that, talk about what kinds of problems the project solved and what it helped the team/group/company accomplish.

If you can't even do that, then I would just mention the workplace and job title and talk up other parts of your history and/or skill set