I just helped my sister switch to TalkTalk (Carphone Warehouse..
20.99 a month (BT monthly line rental included), free local, national and international calls (to 28 countries) plus free broadband up to 8Mb. Only downside is that, due to demand, the broadband won´t switch till June.
I looked at changing myself, but I live in the countryside with an unbundled exchange, so the price would be an extra tenner a month for the extra BT broadband equipment cost (total 31 instead of 21). Since I am working abroad and not making calls, its marginally cheaper for me to stay with my present TalkTalk tariff (11 pounds a month) and with my present ISP, Metronet, who have a flexible tariff depending upon usage. Since I am in Spain most of the time it works out at about 15 pounds a month.
I´ll probably switch when I get back home, but they reckon the TalkTalk offer will force the other telephone companies to match it - and force the other standalone ISPs out of business or into partnerships with the other telephone/cable operators.