I’ve started using RoR recently for some new projects and I’ve been getting sick of trying to remember ruby coding standards, much less RoR. If you’re from a background different then Ruby (who isn’t?) Ruby standards can be a little tricky (I’m not saying they don’t make sense, they make great sense, its breaking the bad habits that’s hard).

Here are the best cheatsheets I’ve found:

Ruby:

• Ruby Cheatsheet v.1 (2 pages)

Ruby on Rails:

• RoR Cheatsheet by Blaine Kendall (14 pages long, Rails + Ruby)
• RoR Cheatsheet by ILJD (1 page, includes directory structure reference)

Textmate + Rails:

• Textmate Rails Bundle Cheat sheet