I haven’t had much of a chance to use Seam yet. I’m looking forward to it though. If for no other reason than a good friend of mine, Mike Youngstrom, wrote the Spring integration. He’s mentioned in The Server Side Seam 1.2GA announcement as well as in Gavin King’s blog. Way to go youngm!
I published the performance matrix from our programming contest at work. The matrix isn’t complete at this time. I’ll be adding more results over time.