I currently got some advertisement space open on my site World of Gaming which is a site comitted to every area of Gaming.
Got 2 spaces open..
The first place is the right menu under the sponsor links.
I accept both just plain links like the ones you see or a vertical banner that can fit in there.
The right menu gives exposure on every page/section on the site.
The second place is on every cheat/hint, faq/walkthrough, trainer, savegame page etc which is our main attraction for all incoming traffic.
Your banner or text links could be placed just above the "last modified" text (Look here)
The site gets between 4000-6000+ unique visitors daily (PM me for proof)
Ive never really offered ad space on my site before, so im not sure what rates would be fair to expect, but if you're interested give me an offer and we'll look at it
if you're willing to add my 88x31 button below your 2 other buttons on the left hand side of the page. I would be willing to pay $25/month, and if it's just a text link on the right-hand side of the page, I will pay $20/month