If I'm walking down the street and think "Oh, I want to call person X", it'd be pretty great if I could just bash their blog URL into my phone, which would then do all the authentication behind the scenes and retrieve their phone number from an hCard on their site.
Bash in "bl.uk" in to your phone and it'll dial the British Library. Bash "tommorris.org/local/curry" in to your phone (for example) and it would list nearby curry restaurant to where I live, which you could dial with one click.
That would be neat. I can remember URLs a lot easier than I can phone numbers - so we should use microformats to turn URLs in to phone numbers.
Discussion