Blog Advance is a free manual blog surf exchange community offering 1:1 ratio and free forum.
Blogazoo is a free blog traffic exchange. Surf other blogs to raise the popularity of yourblog. Post your RSS feed and add your blog to the blogectory. Add Gazoos (credit link) to your posts to increase readership.
BlogMad is a blog trafficking site currently in BETA2 offering 1:1 traffic ratio, blog and member directories, forum, chat, blog ranking, view a random blog promotion, and supports Revver.com videos.
BlogExplosion is very different. You my rent your blog space for credits or enter your blog into the Battle of the Blogs and win (or lose) credits! Other options are BE Radio, Blog Rocket, statistics, blog directory, podcasts, banners and links.
Blog Soldiers offers 2:1 surf ratio, blog directory, text links, banner exchange as well as blog traffic exchange. Blog soldiers has a wonderful education section that provides video instruction on adding your blog, links and banners; assigning and converting credits. Upgraded memberships available.