Define a shortcut for Power Search. System Preferences > Keyboard & Mouse > Shortcuts > iTunes > Search… I set mine to Cmd -F (odd that that doesn't focus on the search field, by default)

Wishlists. Just create a playlist and drag stuff from the store to it. Only works with individual tracks, sadly

Don't forget to de-authorize computer before formatting the HD. It's OK if you restore from a complete backup (including the stuff under /Volumes).

Use the Browse command (Cmd-B)