I'm guessing you mean iTunes store purchases. You simply go and make the purchase again, except iTunes won't let you. It'll give you a msg saying something about you having already purchased this and asking if you want to DL it again.
This at least has been my experience with apps so far.
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"You think that's air you're breathing?"
I called Apple and asked them to re-queue all my purchases. They were nice about it and explained that it would be a one time deal and that I should be backing up my purchases. It was a good experience.
Every item I have ever purchased from the iTunes store appeared in my iTunes download queue. I did some math, realized that I would be downloading for weeks and would also exceed my ISP monthly bandwidth quota. I freaked out a bit and decided that I spend way too much money on digital content. After the crying, I decided that the files that were missing were not worth the time/effort/expense to recover in this manner.
Note: Every iTunes client associated with the account, that is set to automatically check for downloads, will try to download the media files. I have three Macs, it was maddening.
I called Apple and asked if they had the ability to selectively add purchases to the queue? I was informed that they do not have that level of control and that they cannot remove "everything but music". Apparently, they can manually remove items, but it really is a manual process. The CSR has to add and remove check marks.
In the end, I asked the rep to remove all items from the queue.
Perhaps this will all change when iTunes becomes a cloud based service? I hope so
__________________ Apple Stuff: 27 Inch Intel Core i7 iMac, 13 Inch i5 MacBook Air, iPhone 4 32GB, iPad 2 (32GB + 3G), Apple TV 2.
Note that this applies to apps ONLY. Not movies, not TV shows, not music, et al. Apps only.
That's interesting. My experience has been that I can't get rid of iTunes content, even if I try. Every time I deliberately delete an album of movie, iTunes automatically re-cues it up for download the next time I fire it up.