We have some advertising slots on available on http://www.oxyscripts.com
Currently a PR5, with monthly stats ranging as follows (depending upon how 'active' the site is each month):
Hits: 720,000 to 1,200,000.
Page Views: 72,000 to 150,000.
Uniques: 14,000 to 30,000 (that's 500 to 1000 a day).
People who want a link for PR generally take one of the text links at the bottom for $15/month. People who want to advertise generally take one of the slots on the right.
Demographic is mainly webmasters and programmers, specifically those interested in PHP.
More details about advertising can be found at http://www.oxyscripts.com/page-3.html
where we specify our fixed monthly rates, but we'll happily negotiate better deals for anyone who takes more than a month at a time.
Please contact us at info[-at-]oxyscripts.com if you're interested.