I am using RBC Bank (Georgia) as my primary bank, and I have a LoC with them. I use them because I have all my accounts in Canada with their Canadian parent company, they're not a particularly good bank if you don't need the links to Canada. However, I would bet quite a lot of banks allow a deposit into a LoC.
I was able to give it a bit of a trial run because my employer allows me to set multiple accounts for direct deposit, e.g., $x into one account and the balance to another. So one payroll I sent a relatively small amount to the LoC account information (using the transit, etc., from the checks) and just watched to see what happened -- it worked! So next month I sent more, and it worked again, now I sent pretty much my entire salary to the LoC.
I then set up automatic bill payments for the full balance of everything I pay either using the LoC, or a checking account that is linked to it which will draw from the LoC as needed. When the dust settles after a payroll I transfer any credit balance in the LoC to a savings account, so that it's ordinarily sitting at zero -- but as I said, if one month my expenses are higher than usual (Christmas, vacation, whatever) then I run any debt on the LoC for a brief period rather than on cards or elsewhere.
