I always worry about the balance of my resume. I don't mean to lie, of course! But, there does sometimes come a situation where I've worked with something before, but aren't very good at it. For a not-so-good example: I used php for a web site once, know generally how one can use it for simple stuff, but definitely wouldn't call myself well-versed in the subject (I only really used it once, right?). So, probably I shouldn't list it as something I know--that'd be lying. On the other hand, what if that small bit of knowledge that I do have is relevant and useful? How do I say, "I saw this a few times" on a resume?