[jugglinmike]

I believe Web Intents (http://webintents.org/) are designed to address this problem. Specifically: http://examples.webintents.org/intents/share/share.html

[groby_b]

Yes, they are. They're in Chrome 19, if you're inclined to try them out, and the Chrome Web Store already has a bunch of extensions that use them. (Search for 'intents' or use the intent picker's suggestions)