How To Ping iTunes

If you send your RSS feed into your iTunes podcast directory, usually often occur some time lag between when you post your item to show you really Podcasts appear in iTunes. To fix this problem you can manually "ping" iTunes.
First go to the iTunes Music Store and find your podcast.

 Right-click your podcast's title or album art and copy the "iTunes Music Store URL".

You should have copied a string of text like:http://phobos.apple.com/WebObjects/MZStore.woa/wa/viewPodcast?id=220385199
The long number in last part of the URL is your unique podcast ID. In this case the number is 220385199, yours will be different.
Now that you have your ID, open up a web browser and type in:
https://phobos.apple.com/WebObjects/MZFinance.woa/wa/pingPodcast?id=xxxxxxxxx
Change the "xxxxxxxxx" to your podcast's ID and hit enter.
You should get a message saying the ping was received.
Warning ! In most cases, the music store will update and add your podcast within a few minutes but it could take longer. Just be mindful not to ping iTunes too frequently, as it may cause some problems.
Resource : getsatisfaction.com