Just got the E-mail that the Froyo 2.2 version of the Sirius/XM App is available. This should fix the skipping issue that it had once you went to 2.2.
http://www.siriusxm.com/mobile?utm_source=ONIPHONESIRLOGIN&utm_medium=Banner&utm_campaign=APP
http://www.siriusxm.com/mobile?utm_source=ONIPHONESIRLOGIN&utm_medium=Banner&utm_campaign=APP