Some dumbass in Korea is desperately trying to gain access to my home system. In less than 6 hours, the system has made over 5,000 unsuccessful attempts to get in. I'm not sure if "phone book" is the right term or not, but they are going through a (very) long list of usernames and attempting to log in with them. One IP address the whole time, just not giving up.
Not that I expect it to make a difference, but I sent an email to their ISP.
This is an interesting change from the distributed attacks that I was used to seeing. Not sure if the two are related or not but I do seem to be seeing a larger number of attacks since being issued a new IP address at home.