What I do to avoid this is whenever I read a book I put a little dash in the margin next to anything that's worth remembering, and then after I finish the book I copy down all these sentences into a mindmap. The means that I've read all the insightful/informative parts at least twice, typed them once, and then have them in a format that makes it really easy to refer back to them.
I'm using .9RC4 right now, it's great. The only problem is that the flash exporter doesn't seem to be working with Firefox 3.5RC1, but that's a Firefox bug so who knows when it'll get fixed. It worked fine until this week, and it still works in Safari and every other browser :-/
The only caveat is that some of the default appearance preferences are a little wonky in the .9 release. I'd recommend turning on full antialiasing, and checking the box that says "Edges start from one point at root node." (And turning off the text editing box at the bottom unless you are going to use it.)
No problem. The reason I like it is because writing full marginalia breaks my train of thought and makes it harder for me to get through the book. If I'm reminded of something I'll still write it down on the spot, but otherwise this system is more efficient than other things I've tried.
