Until they are gone, you can advertise your blog or web site at Serradinho's Free Pixels!
Just head to the site, stake out up to 6 squares, upload your banner and the URL it should link to and you have a graphic link to your site. That's hard to beat for free.
As of today, about 1/3 of the real estate is taken.
|web ad income today (4 blogs, 2 web sites):
Project Wonderful $.02
Total to date in April $9.76
Total in March $4.88