Ruby on Rails: Wow, just wow!
I've been digging into the Ruby on Rails framework lately. All I can say is "wow!". The greatest barrier for entry for me so far has been the oddities of Ruby syntax. However, the Rails framework is extremely simple to understand and the benefits are huge, I can really see lots of potential here, particularly for super-rapid prototyping.
Watch this webcast to see a blog engine created in 15 minutes (and a fairly decent workout of the Rails internals) and see what all the fuss is about!