There was a fair amount of buzz at JavaOne about JBI and there have been various recent discussions on its merits, but its basically a standards based API to ESBs (Enterprise Service Bus) supported by a bunch of vendors like LogicBlaze, Iona, Sonic, TibCo, Sun, FiveSight etc.
We've been working away over at codehaus for some time building an open
source Apache Licensed JBI container and component suite called ServiceMix which you can drop into Spring or Geronimo, which should have its first release very soon.
One thing we did while at JavaOne was to add a JBI deployer into Geronimo. This means that the standard Geronimo deployer can now automatically detect a JBI deployment unit (any jar which includes META-INF/jbi.xml inside it) and then auto-deploy a JBI component or service assembly. If you want to know more, see the full details.
Coolbeans! So now Geronimo is now the first J2EE (nearly) certified container which has JBI support! Yay! :-)