If they're DDos'ing a hosting company, they've actually got some firepower then. Unfortunately, since you're not hosting, you can't set up blocks on most DDos like you could if you hosted yourself.
Hey don't wait! Rtoolkit is fantastic and effective right now! Auto restart and recovery, autosaving, and simple telnet to console; what more could you want?
http://forums.bukkit.org/threads/admn-remotetoolkit-r10-a12-restarts-crash-detection-auto-saves-remote-console-1597.674/