Raptor: A Forthcoming Ruby Web Server for Faster App Deployment - Raptor bills itself as a new Ruby "app server” and it claims to blow everything else out of the water performance-wise (by between 2-4x!) whether that’s ...
#1 MerbCamp - Yes, all merbists have seen it.
#2 Merbunity - It's maintained by hassox!
#3 Atlanta ruby user - I found this site recently. I think it's worth to see.
#4 Merb Dependencies and Bundler - by
#5 peepcode (well, not free. but it's 9$) - The screencast was recorded on merb 0.9 but it still is a good one.
And there are good tutorials.