I've been looking around here and in the Apple support discussions and can't seem to find how I managed this. I have an iphone 4 and ipad 2, both on 5.0.1 and both set to sync over wifi. My itunes and aperture libraries were originally both on my mbp, and both the iphone and ipad synced to that before ios5. Before upgrading to to 5, I moved my itunes library to my mac mini server and set both devices to sync there instead.
My original plan was to also move my aperture library there, and either use it over the network on my mbp, or work with multiple libraries, copying changes back and forth. That was until I noticed on my iphone that it is still syncing photos from my mbp. Going into Settings-General-iTunes Wi-Fi Sync, I see the mbp listed for photos and the mini listed for everything else. This works out perfectly for me, but I can't figure out how to get the same thing set up on my ipad. I'm also not sure how it did it that way for the iphone.
Edit: Well, just after posting this I found the article below which mentions the feature showing up in the beta, but not how to configure it.
http://www.mygreatiphone.com/info/ios-beta-7-adds-itunes-wifi-sync-to-multiple-computers/
My original plan was to also move my aperture library there, and either use it over the network on my mbp, or work with multiple libraries, copying changes back and forth. That was until I noticed on my iphone that it is still syncing photos from my mbp. Going into Settings-General-iTunes Wi-Fi Sync, I see the mbp listed for photos and the mini listed for everything else. This works out perfectly for me, but I can't figure out how to get the same thing set up on my ipad. I'm also not sure how it did it that way for the iphone.
Edit: Well, just after posting this I found the article below which mentions the feature showing up in the beta, but not how to configure it.
http://www.mygreatiphone.com/info/ios-beta-7-adds-itunes-wifi-sync-to-multiple-computers/