There's a feature in all my rivers that makes it possible to RT a post, directly from the browser to your linkblogging tool.
Here's an example of one of the rivers.
It works with Radio2, and probably nothing else. But any other linkblogger could support it by accepting three parameters. They are: link, title, description.
They came straight from the RSS item.
The first time the user clicks a RT, a dialog asks for the domain name of their linkblogger. It stores it in a cookie, so the user never has to enter it again.