On my resume, I have a "skills" section that basically lists technologies I've worked with that I'm interested in working with now (and some I haven't work with) with a "code-word" based description of how I'd rate myself. The "code-word" selection will beat most HR folks, but I include a "decoder-ring" style description in my cover letter on what I mean by those code words. Things like, "familiar: know at least basic syntax and can easily use all syntax with reference, will likely need to use a reference for common libraries" and "expert: Need documentation only for infrequently used or obscure library calls, comfortable writing a tokenizer and lexer for the language given the specification". I actually got the idea when I applied for a job way out of my league and actually got a response explaining it was out of my league, so I asked for some feedback on my resume, figuring don't let a good thing go to waste and the response was "years of experience in a language doesn't quantify your knowledge of the language." I was quite young at the time and the approach I ended up with hasn't steered me wrong yet.