Also read my bug-report about hacking it.
I didn't want to litter the bug report too much with suggestions, so I put them here.
Any good flash game scoreboard is time-based these days, so you have "highest score ever", "highest score this day", "highest score this week", etc. This is very important actually because if you only maintain highest-score-ever then after a few months the scoreboard will only contain the top-10 of the world and for 99% of the players the scoreboard just became useless. You can do this even if you don't care about people hacking it, because then at least the old hacked entries will not keep littering the time based scoreboards forever.
If you care about the scoreboard and think about doing an account-based solution it would be great if you could compare yourself to your friends. I understand that's a lot of additional work though, so I it may not make it, a simple search-function would be a nice start though.