I as wondering if anyone knows a greasemonkey script which would add a "retweet with comment" to the timelime items. I was looking for something that would have a similar appearance to tweetfilter, with the little buttons added at the end of the tweet.
It adds the current tweet text in to to your new tweet box prefixed with RT - this will then enable you to add comments to the tweet before posting.
Other third party applications have this functionality built in. For example, Seesmic Desktop 2 has a