clean install and iphone apps

[rdsii64]

I'm sure this has been discussed to the high heavens but right before I leave for work my search-foo is week. If I decide to do a clean format and install of snow leopard, how do I get my iphone apps back. I'm don't care so much about my itunes music and videos I have physical backups of that stuff.
What I am concerned about is not having an iphone back up to sync with and loosing all my apps.
I did find the folder that the iphone back up is stored in and copied to my idisc.

please advise.

 

[Housekat]

Well, when you purchase apps, itunes records it in your app store. So you can just redownload them and it shouldn't charge you.