Pagerank 4 (four), several PR4 subdomains to choose from. Link on right sidebar, front-page (recommended) or site-wide (some static pages). Max 10 slots.
Niche: Web development, programming, PHP scripts, WordPress themes and plugins.
Price: $5/month or $50/year. Payable via Paypal subscription.

PM for urls if you are interested.

PS: PageRank 5 links also available for $10/month.