One account to bind them all
I wish Google would start designing for people with multiple Google accounts. I have one from when I registered my original GMail account (and a couple of other single-use GMail accounts). I also have, at present count, five Google Apps for Domains accounts.
Right now it's a complete mess as every google service more or less assumes that you want to use the Google account you are presently signed in with. It's making using Google Docs & Spreadsheets very awkward in terms of access control.
What I want is one Google account to bind them all. Or, better yet, to be able to attach them all under an umbrella OpenID (such as my i-name). Like that's ever gonna happen.