I pay all my bills online. simply, easy and I can do it at night, when the kids are in bed, no distractions. I also like that I have a record of exactly when and how much was paid.
I pay most of my bills by check - mainly so I have a receipt. Sometimes I'll use my debit or credit card if I'm ordering something online, but only if I trust the website. I rarely pay for anything in cash anymore - even at the stores.
Most of my bills are paid online.. and some are set to auto-pay, like my mortgage. There are still a handful that have to be done the old fashioned way. And then the occasional bill that has to be paid by check.
My husband pays most of our bills online through his checking account he has set up. On occassion though we do mail a few in- we try to do everything online though.