I did a talk at QCon a while back on the different Ruby Virtual Machines. You can check out the presentation the InfoQ web site: Ruby VMs: A Comparison.
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This is the personal blog of Jason Seifer. I'm a web developer, podcaster, and beer geek. You can find me elsewhere on the web at Twitter, Flickr, Fotolog, Friendfeed, LinkedIn, Last.fm, YouTube, Vimeo, and Twisted Mind.