You are probably using version 2.10, for which YouTube support was broken, because YouTube changed something on their servers again. Please get version 2.11 from Extras-Testing (as it has the YouTube fix included) or wait until it is promoted to Extras. The QA quarantine for 2.11 ends "2010-12-30 01:15", so shortly after that I'll promote it to Extras (gPodder 2.11 still needs two more votes, so please vote if you haven't already - http://maemo.org/packages/package_in...podder/2.11-1/) Thanks!
Where there's a will there's a way-N900 RoCK!!