while ADSL and its variants have a lot of promise, for most businesses it is not very viable. the big problem with DSL is it is really a point to point solution and all your traffic needs to pass thru an ISP to get its destination. One big issues for any WAN traffic across the internet is the lack of quality of service. the internet does not offer any commited information rates (CIR's) that telco's do for their T1 services.
T1's offer point to multipoint traffic (via frame relay) without having to submit that traffic to the internet and the lack of quality of service.
that is not to say that that will never change, but for now, DSL is fine for companies that strictly want internet access,. if your company wants to do any of the following:
Voice over IP (toll quality)
H323 video conferencing
then DSL is not the choice, t1's within a frame relay is the way to go.
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