We created a complete Ruby on Rails setup script for Mac OS X. Give it a try if you are bootstrapping a Mac for Rails.
If you are having problems with Hpricot, update your gem to 0.5, which has improvements.
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One project is looking for menu system suggestions, so feel free to mention your favorites.
We had quite a conversation about saving URLs in model objects. For example, what if you have an internal mail/message system on a site, and you want the system to embed links such as “click here to view the sender’s profile.” As the system is refactored, the target of those links might change and we’d prefer not to have to search for URLs in the database and change them. As we implement a solution perhaps we’ll post it here.