Sites that I have found for free traffic exchange. I’m not using all of these, I’m considering adding one of them. The trouble is making space above the fold for more than one. Also, not sure I want more cause they do look like ad clutter. But, I’m enjoying EntreCard and My Roomie is such a cheerful looking site. Likely some will stay and some will go, over time. I find the more stuff you try the more interesting things you find.
Blog Explosion (Rent My Blog is currently offline, for maintenance they say but it seemed to be mothballed quite awhile).
If you know of others let me know.