Will Libraries work like Smartfolders on OSX? Saved searches in Vista are horrendously slow and don't work very well. Can I define my own Libraries? I'd like to be able to say "This is a view of all my avi files >20min on all my disks that I haven't seen yet", have this query run locally as well as my WHS shares, and be updated in realtime.

And why can't file metadata be attached to every file (for god's sake, NTFS has had ADS forever) instead of the stupid limitation on tagging only certain types of files. If we can tag any file, define custom searches that use that metadata, and compose Libraries out of these searches, then we are very close to the holy grail of WinFS. But I'm almost 100% sure this is not what we'll get.