Quite useful OP. There are some issues with syntax highlighting[1] still. Also, I'd really like to be able to "manage" my annotations. I can store link, no problem, would just be a lot nicer if I could "own" all my annotations. Perhaps using an account system or something?
Otherwise, nifty tool +1
[1]: http://prntscr.com/dp3mv1 and http://prntscr.com/dp3mkg and http://prntscr.com/dp3n0r