In Australia there is (in theory) a way of getting ADSL from one provider with "dial tone" from the incumbent telco (Telstra), it's called the "Spectrum Sharing Service" (SSS).
There is also the "Unconditioned Local Loop" (ULL) where the incumbent telco will just charge for the pair to your home from the exchange, and you can then get xDSL from whoever has equipment in the exchange.
I don't think there has been too much take up as yet of these services, but a fair few ISP's are installing their own DSLAM's in Telstra exchanges at this moment.
There are some links to FAQ's and technical info here for anyone that's interested:
Regards,
David Clayton, e-mail: snipped-for-privacy@XYZ.myrealbox.com Melbourne, Victoria, Australia. (Remove the "XYZ." to reply)
Dilbert's words of wisdom #18: Never argue with an idiot. They drag you down to their level then beat you with experience.