@smallfry
I have written a script in php that does this, although I haven't tested it since the recent chg to the site, but the basic mechanics will be the same.
Basically to do it you need a seperate proxy per account, else you will get them all banned. The you simple take each of your (100+) users and auto login, digg a random number of random new and pop articles, plus the one article you really wanted to digg, for each user, switching the proxy each time (keeping same proxy to digg user).