My rails mentor and I did a bit of paired programming this afternoon. I felt extremely productive for that hour and a half and was once again impressed by a) rails and b) my mentor's rails savvy.
Some tips I picked up along the way:
I have seen this in action before in a few webcasts but always chose to use mysql instead. I still MAYBE prefer mysql, but as I get more familiar (and want to be more familiar) with ruby, this is a better alternative.
Is a good api reference for rails and ruby.