This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
FormLayout from JGoodies is pretty much the choice of champions for serious swing development. A bit complicated, but very powerful and much more pleasant than GridBag IMHO. Also MigLayout looks interesting. It's built on top of FormLayout so promises to make it easier to use, although I haven't tried it yet.