Screencast: How To Upgrade Your Rails 2 App to Rails 3 in 25 Minutes
Geoffrey Grosenbach (of PeepCode fame) has put together a FREE 25 minute screencast showing how he's converted a Rails 2.x app to Rails 3.0. Grab it now before it gets overwhelmed and he wonders why he hasn't charged for it yet ;-)
In the video, Geoffrey takes his personal news site from Rails 2 to 3 and demonstrates the upgrade process live. With the first official beta/release candidate of Rails 3.0 due to drop in the next 24-48 hours, it's well worth watching, if only to get a feel for what might be happening in your near future.
As typical for Geoffrey, the Peepcode is high def and top notch quality. At the least, download a copy for future reference, but be warned.. it's a 100 megabyte download.