Team Discovery just announced the release of team leader Ivan Basso. He is leaving to address questions stemming from the Puerto doping scandal from last May in which 50 riders were denied entry in the '06 Tour de France. This leaves open the door for Levi Leipheimer to lead Team Discovery. Levi won the Tour of California earlier this year, but 5 days riding around your hometown is different from 22 days riding around France. Basso was Lance's pick to lead Discovery in the TDF but I think Levi can handle it. He's a good time-trialer, a good sprinter, a smart team leader, and an excellent climber.
If any of you are interested in reading some more about American and world cycling, I highly recommend Endless Cycle, hosted by peloton Jim. He's got a cool site in which we discuss all the current goings-on in cycling from Floyd Landis, the Puerto doping scandal, to Levi taking the lead role on Discovery, to other larger issues tangentially related to cycling and sports. Really, you should check it out.