Setting up your MacBook for ROR

I am getting my new MacBook today and was wondering if the experts on
this list might have some tips and pointers about what they do to set up
their Macs as a RubyonRails dev machine?

I come from a windows background and some of this is essential there.
But in the case of Macs do you recommend,

  • installing the OS from scratch
  • adding/removing any default applications from the install
  • any other system/OS level tuning

I do intend to use the Hivelogic/Geoffrey Grosenbach’s tips to get the
Ruby, Rails, MySQL, Mongrel setup done. Suggestions/comments welcome.