I was on the hunt for a Rails cheatsheet and found a blog posting with links to quite a few cheatsheets, done by Dave Child. Others that I’ve found along the way:

• Blaine Kendall’s Rails PDF Sheet (14 pages)
• Scriptaculous PDF Sheet from Slash7
• Rails Forms from Slash 7
• Rails Migration PDF from Garrett Snider
• Ruby Quick Ref from Zen Spider

BTW, I created a Cheat Sheets Squidoo Lense to track these links.