Switching from DTV to Comcast Digital Cable. Questions.

[hondaman]

Ive only been concerned about DTV and how it interfaces with BTV since ive been working with this setup. I really dont know anything about cable, or how it works with BTV, so I have a few questions:

Comcast Digital TV works with BTV I assume?

In choosing which reciever to buy, which features should I want? Will firewire out on the reciever help or even work in conjunction with BTV?

Any "gotchas"?

For those who have comcast (or any other cable tv service, really) what do you wish you could do different? Either in regards to the service plans, the recievers to pick, options you wish you had chosen along the way, etc.

Thanks!