I've just noticed a new share icon in my google toolbar. I've not seen it before, and I don't know how long it's been there. I havent updated my toolbar recently, so it must have auto updated. The button looks like this:

The Share Web Page feature of the google toolbar version 6 (codenamed Dangermouse) allows you to quickly share a url on one of 58 different services. Whats more, google have their own URL Shortener with the Share feature - goo.gl which you can use with Twitter.

I really like this feature, it saves me having to display loads of service specific toolbars like linkedin and del.icio.us and have them all in one handy place.