Everyone is talking about web services and web service choreography, but only one company is actually doing it: Collaxa.  Yes, IBM has a toolkit of sort, but it is prototype quality IMHO and just an engine too boot, leaving you to build and integrate rest of the beast.  BEA was smart enough to recognize this and written an eye popping tutorial using Collaxa's tools.  Go check out what Collaxa lets you do without a lot of XML and Web Services hassle.  You just know this is what everyone else is trying to mimic right now.