I know they only have a limited range, but Irish Broadband (the company) seem to be very good.
They have a range of services, what I’m posting from is a 2meg up, 2meg down connection (the upload speed beats the hell out of adsl), with no bandwidth cap.
It’s reasonably priced, if not cheap, low latency, high uptime, low contention, and good customer service.
I’d recommend them if you’re in their service area, and need good broadband.
I have, however, heard mixed things about the ripwave service they also supply.
The smart thing looks interesting, although you have to treat all claims with a grain of salt till you’ve seen them deployed.