For those of you using the rMB as a second (I assume, ultraportable) mac: How do you keep your rMB in sync with your other mac(s)? Do your updates to documents--say, annotations in PDFs, edits to .docxs, etc--seamlessly transfer to all the machines (if you so intend)? If you do academic work with lots of sources and programs like Endnote, Zotero, Mendeley, Papers, Scrivener, etc., how does it work for you keeping your libraries constant across all of your machines? How about your photo libraries and iTunes libraries? What about things as mundane as sets of Safari tabs?