ICloud – Does the AppleTV support multiple Apple ID accounts

What I would do is:

• Have only 1 library
• Make sure that iTunes is configured to keep all your media organized (and point your single iTunes Library to your preferred disk)
• When adding files to your iTunes library hold down Option/Alt to let iTunes know that it shouldn't copy the file to where your library is

This way all your data will be organized by iTunes except for the large files that should belong on your largest external disk in the first place.

Cheers...

You can set up multiple different iCloud accounts in the "Mail, Contacts, and Calendars" preference panel, and also on your iPhone and iPads.

I have accomplished a shared address book with my partner by each of us having a primary iCloud account (me@us.com, her@us.com) - and then a shared iCould account us@us.com.

One annoying downside is that the Lion Address Book app labels both address books as "iCloud" making it a bit hard to distinguish what contacts are where. We solve this by having different contact lists in each address book, so they are distinct.

It seems with just a little bit of work Apple could make this MUCH better, but this is the best solution I have seen so far.