I personally don't like the Ruby implementation on Mac, since I had a lot of problems with MySql, Postgres and other gems, there were always obscure compilation problems that required me to install Xcode and then compile all kinds of obscure libraries. In the end I decided your problems by installing Ubuntu 8.10 on VirtualBox for Mac, and now everything works fine !!!!
Also, when I switched to Snow Leapard, I had a lot of Ruby stones. In addition, I would recommend using Ruby 1.9, which is certainly much faster than 1.8.6 IMHO, again, works best on Ubuntu, not Mac.
I guess I would also like to add that many Unix Christians disagree with me on this post, since you can make it work on a Mac, but I think I'm just lazy and prefer to have things work out of the box.
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