I'm using deepbit
I've downloaded diablo, i go to cmd and type DiabloMiner-Windows.exe -u
myuserID@email.com -p mypassword -o pit.deepbit.net -r 8332
but it keeps saying cannot connect/or invaild user name... they are all correct
You need to create a Deepbit worker and then append the worker number to your email address as the username.
Also, I recommend you use a pool other than Deepbit, simply because of the fees they charge.