JavaFX
I like the concept but am not exactly enamored with the execution. I've been watching the project for a while but I feel the approach is wrong. If you look to any other platform, most notably .NET, there are a small number of ways to do things, many times even just one. It's often been said that Java dies from the ability to choose, splitting market share so much that developer confusion ensues. I'm not suggesting that there be only one option. If a new one is introduced, it should bring significant value. No disrepect to Chris Oliver but I don't believe it does. As noted elsewhere, the syntax is a bit reminiscent of the SwingBuilder. No worries about that, it's not like Groovy has a patent on syntax. :-) My main gripe is that it seemed like the FAQ bashed Groovy for no reason.
"Groovy and other languages have two specific traits which don't precisely meet these needs, namely that they are generic in nature and don't provide the appropriate abstractions necessary to optimize the UI design process and similarly are designed specifically for programmers other than content authors."
Builders can make Swing incredibly simple. One could argue that Groovy builders trump F3 cum JavaFX because they are ingrained into the language and not a DSL on top of Java.
We have had to explain for years that ECMAScript(Javascript) and Java have nothing to do with each other and was just a marketing ploy. "You're good in Java, right? Do this JavaScript thing for me." F3 was cool, descriptive, very mathematic. JavaFX is blah. For the record, I prefer AB5k over Glossitope as well.
Since I'm coming close to a decently working version with barebones functionality, and a decent amount of chatter on the mailing lists, I've talked it over with MrG(Guillaume) and I will be implementing some of the F3 demos with the Swing(X)Builder. ETA is currently unknown, I wanted to wait a little bit to really familarize myself with it and not be one of the also-blogged in the aftermath of JavaOne. Expect it in probably a couple weeks.
[Yeah, it's a made-up phrase, or so says Google. In this context, I mean blogging on something after the fact being nothing more than a regurgitation of established facts and/or stints of blatant anti/fanboy-ism without any offering of either new or supporting data.]