They are worth looking at I use Vonage and they are great - £7.99 for freel calls to the UK, USA, Canada and several countries in Europe. IF you are on ADSL though you'll not be able to ditch your line as you'll need it for the BB.
Still worth looking at.
If you go with Vonage then they'll supply a router for you, I found if people call them to place the order too rather than do it online then they tend to knock the activation cost off too
