Only available to Kickstarter backers till now, The Ruby 2.0 Walkthrough is now available to the public for $29 ($5 off with code
FRIDAY). It's a compilation of videos (plus a PDF e-book) that covers the changes between Ruby 1.9 and 2.0 with examples and explanations. It also includes The Ruby 1.9 Walkthrough for free which is even more in-depth and covers all the Ruby 1.8 to 1.9 changes. If you want a preview, check out this 7 minute about Ruby 2.0's TracePoint feature to get a feel for the sort of videos in the package.