I've been paying bills online for about 3 years. It's great.
Now, I only send out 1 actual payment per year -- county taxes. I mail it with a check because they charge a $3.50 processing fee for online credit card payments. Its the principle.
That's about as long as I have been paying bills online. It's convenient and I love computers anyway. And boy, do I hate making out a check for my Avon orders now. LOL!