One of the things that I sometimes do with tasks that involve work on websites, or with the computer, is to create a quick screencast of what I'm thinking of doing, and then linking that to the task itself. <shameless plug>There is a great tool that I use for doing this that my company makes called Jing that allows you to make quick videos for free.</shameless plug> When you click the share button, it uploads the video or image to a server and then posts the URL back to your clipboard. Then I just visit RTM create a quick task and then paste that URL for the hyperlink. Now I have both a task with some thoughts that I quickly recorded in a video format to watch later!

Here is the idea in screencasted form.
http://www.screencast.com/t/MjM5MDMxOGEt

I've also mentioned the idea of having an official output in Jing to RTM via the API if the developers can get the time to do it. That would be even more convenient.