I totally love the ability to give a plug-in a star rating and be able to see later how I rated it.
Next step: I need a way to see a list of plug-ins that I have rated, and I would even like to see a list of ones I still need to review.
So, the easiest way I can think to do this is add a bookmark for each. I could probably use delicious or something, but it would be really cool if it was baked into wordpress.org.
Then I could see a list of all bookmarked plug-ins with ratings and maybe even notes from forum or just tags. If it is unrated by me I will know I am interested in it but still need to review it.