Double Shot #667

It's time to work on filling my dance card for April, just in case you were looking for an extra pair of coding hands.

• Make Sure Your Rails Application is Actually Caching (and not just pretending) - Good advice as you're trying to tune performance.
• markItUp! - jQuery plugin to turn textareas into markup areas.
• ideone - Pastebin that also allows running code.
• Rails 2 and Rails 3: So Happy Together - One solution to running both on the same box, though I think disjoint ruby environments is probably a better idea.