Excellent post from Dan Benjamin at HiveLogic has recently been updated to cover the latest versions, covers everything you need to know to get your Rails development running on the Mac.

Building Ruby, Rails, Subversion, Mongrel, and MySQL on Mac OS X

Andrew,

Another resource if you’re wanting to quickly set up rails on mac os x is to use locomotive . It doesn’t do mysql or subversion but I already had both of these on my box because I currently do php development on my laptop.

Thought that link might be useful for others not looking to get into rails full time.

@andrew: i used that guide the other day – i’d only owned my mac a few days so i’m a total newbie – and it all worked perfectly without a hitch. i was absolutely delighted. highly recommended!