Google Voice Autodialer — ie:, any way to send a phone number to Google Voice (or the google-chat plugin) in order to initiate a call?

This is a dumb sounding question, but I've tried to find an answer digging through FAQs and forums, and came up short.

Just like you can use tel: in hyperlinks for mobile browsers, you can set a link to start a call with Skype's software with:

Call This Number

Is there any way to do anything similar with Google Voice? Or, as of recent, Gmail? Or the Google/voice/chat/whatever plugin? It seems they're really trying to solder a lot of their projects together, and I understand there's nothing like a desktop software package, until/unless they decide to overhaul their 'Google Talk' to support VoIP calling.

But, surely, with all of this stuff going live, there's a way to just link a phone number manually. No little API? Can't send POST/GET somewhere?