My $.02:
In general, I think that the site looks good, but would benefit from a few changes.
If you aren't using lightbox on every page, avoid including the scripts to run it: while these scripts are often cached, why risk increasing bandwidth?
The content doesn't stand out from your ads (this is a pet peeve of mine, probably others) and makes the page more difficult to read.
The top navigation tabs should indicate the current page - A List Apart has a great article on how to do this.