From MacOSHints: :
… I had two major problems I wanted to fix with iTunes podcasting. One was that it didn’t update them if I happened to quit the app (unlike Safari, which uses SyndicationAgent to monitor feeds). The other was that the built-in scheduling only makes three huge jumps between hourly, daily, and weekly. The combined problem being that if I happened to quit iTunes before a nightly update, I wouldn’t have anything waiting for me until I noticed the problem when I wanted to sync my iPod in the morning … and then the scheduling was wrong for every day afterwards.
The solution is a simple…
Read more here:
