We moved to TalkTalk (from Virgin) in December 2007, and get their Talk2 plan:
'8'Mb BB (40GB/mth download limit - have never been close to exceeding this), plus telephone (can keep old number) including line rental, with free evening and w/e calls for around £16.50 (+ any calls that aren't free) per month. No problems with the phone.
We've not had any probs with BB since signing up. TT have had some negative press in the past, so I was watching them like a hawk for the trial period. At one point, a few months ago, the wired modem started having to be rebooted at the beginning of each session. I mentioned this on their help forum, and received a new one very quickly in the post; was impressed.
We got one of their £30 D-link wireless routers last month, and it's great. We're about 1-2 mls from the exchange and most of the time seem to get ~ 5-5.5Mb BB speeds. e.g. iplayer on HQ, streams very well all over the house, and the walls are v.solid.
We have about +4 mths left of the 18mth contract and plan to stay with them.