WebSphere ESB class by IBM; Raleigh NC, USA; October 9-11, 2007.
"Building WebSphere ESB Solutions within the IBM SOA Foundation" is not yet open for enrollment. If you're interested, register for notification; IBM will use the number of registrations to gage interest and decide whether to actually hold the class. There's no cost listed, but I believe these typically cost $1500/person.
This class is a RedBook Workshop. The sight currently lists 178 workshops total in the next several months at sites all around the world.