Renting blog space is a great idea and is definatly a great waste of some time. The program is easy. All you do is dedicate a little space on your blog and for a week another blog owner has a screenshot of their blog placed there. The renter pays me credits, which in turn is site visits. Great stuff. I love it!
My blog is being rented right now (for only 13 credits) by The Stop Button which is dubbed "An appreciation of amusements." and fittingly so. This blog is right up my alley with a bunch of conversations on movies, which of course I also love. If anyone is reading this, check out that blog too and next week, check back to see who's renting.
So, all in all, if you're lookin' for more traffic to your blog, check out Blog Explosion. I think you'll like it. I do.