After some digging, I found Erik Lundqvist's MyClippings Java app for both Mac and Windows. It ain't pretty, but it'll export the file into HTML, CSV, or DOCX (for Word). From HTML, I just copy/paste into Google Docs, which makes my notes searchable.
How do you handle your Kindle annotations?
* Whenever I read anything (book, magazine, whatever), I take notes from it—quotes, passages that resonated, things to research further, etc. And because I'm a geek, I must eventually type up said notes, so that I can search them later. My nerdy note-taking goes way back—I've still got notes from 2000, when I used to scribble them into MacNoteTaker on my Palm V in Graffiti. Yikes.
Update: Dunno when this went live, but you can now see Kindle clippings on Amazon's site.