I used to mail cheques to the utility companies and credit card companies and whatnot, but then I discovered that I can pay all of those bills at the bank down the street. They don't charge me anything for taking those payments, either, so it's definitely cheaper than paying for a stamp, an envelope, and a cheque. And it's right down the street so I can walk in, pay cash and get a stamped receipt on the spot.
I'm sure someone is paying them for the service of taking my money and sending it on like that but that someone isn't me, so I'm pretty happy about that. It saves a lot of stamps, and cheques.