Would be great ... Rated 4 out of 5 stars
but I haven't been able to make the fix suggested by Brian Kelly. I have IZArc, but I can't work out how to put the updated Install.rdf file back into the original .xpi file.
I used to use another note-taking extension, then switched to Message Notes (which also doesn't work with the current TB), then switched to this. I found this to be the most useful, but it isn't working for me anymore. For anyone with TB lower than 2.0 (or TB 2.0, if you're intelligent enough to work with archived files), I highly recommend this. I can't tell you what a difference it makes to be able to take notes while you're processing your email.
Ideally, the author should update this to TB 2.0 so there doesn't have to be a workaround (however simple that may be for the truly computer savvy), but for the rest of us, if you haven't updated to TB 2.0, you need this!