Good Looking site, you know if you increase your page rank and score some Alexa (say top 1M) you could be looking for +$500 mark. You would be making that in paid text advertising anyways. Just from a development point of view I would keep going until the site gathers some serous metrics! Once again top site
I did a some profiling on your traffic numbers and noticed that your site is relatively new with about 500 visits for May /08 with no recorded visits prior.Give it a month or two for Alexa and wordtracker to update their indexes, you should see your self in there listings. The way your site's heading you should make the top 1m Alexa mark (or better!) considering the fact that your site offers the latest High Definition free wallpapers, (freebies are a natural traffic magnet!) I've seen many sites listed in TLA (text-link-ads.com) in the top 1m zone offer $50-$500+ monthly for 30 character link ads, many of which being sold regularly. WallpaperHD.net looks to yield a prosperous future just give it a few months to mature on the net and best of luck with it!