I don't advertise all that much, not because I'm some kind of noble guy who's just so nice he won't advertise, but because I'm too damn lazy to link to things. I'd go with a banner though, it's how I used to advertise my stuff. It's hard to make, and you usually have to pay to get it made for you, but it's worth it. Banners catch eyes, and things that catch eyes catch clicks, and clicks catch members.

My sig is humorously relevant.