Not on-line mainly due to previous 'screw-ups' by the utility companies.
When I get the bills now, its usually a case of looking at them with a concerning eye, then querying them about the over-charge.
One thing that does annoy me, is the fact that most major companies are now insisting that you use on-line methods, and not doing so will produce a 'fine'. Once again, the people who cannot afford computers and internet services are being discriminated against. And please don't tell me that their are local library's and perhaps internet cafés.
My ISP have just told me that I 'must' have on-line billing otherwise its going to cost an extra £1.95 a month, and I must pay by continuing debit card payment now instead of previous credit card arrangement, otherwise I will have to pay a further 95p a month.