This is pretty cool. If you are using the latest builds of the Chrome browser for Mac with the ability to install Chrome extensions, you can now install Google Voice into your browser. It adds a little icon to the right of the URL/Search bar which lets you make calls/SMS/Check your messages.
Perhaps the best feature though, is that you can make calls directly from the browser – just like you can on your iPhone. Chrome will create a hyperlink on phone numbers it finds in the browser. The calls go through whichever phone (including Skype) you have set up with Google Voice. Eventually, once Gizmo5 is properly integrated with Google, you’ll be able to make the full transaction without leaving your browser.