Checkout http://authoringebooks.com/ http://authoringebooks.com/ it's $50, but it's by jeremy mcanally and he wrote http://www.railsupgradehandbook.com/ http://

Checkout http://authoringebooks.com/ http://authoringebooks.com/ it's $50, but it's by jeremy mcanally and he wrote http://www.railsupgradehandbook.com/ http://www.railsupgradehandbook.com/ making $40k in a year. So I think it covers a little about what tools to use etc..