There appears to be tighter integration with other services - there's a section in Settings that has Accounts. The "add an account" offers Skype and Dropbox as first-class citizens. I assume that's only because I have the apps installed? I'd actually already configured Dropbox through 1Password, and Dropbox is listed in my Accounts list right next to my Google account. It's an interesting level of integration...
Been like that for aaages. Eclair I think? Before the accounts were listed as a subsection under Accounts but that's always been there. Exactly the same as with FB/Twitter. It's up to the application itself to insert itself there.