I don't really think any of them sugested are any good for a webmaster site, except maybe valueclick as webmasters probably tend to click links more.
I think he was after affilate program sugestions which would probably be much better for his target audience as they tend to actually buy stuff.
I don't have any particular sugestions but i would use programs for hosting, software (including scripts like forums), ebooks, design services, books (relevant books) , ad network programs that pay you for signing up other webmasters, domain programs, free webmaster tools program e.g short url's (I have seen on of these on fineclicks).