Alternatives to Con Ed and Keyspan: Worth It?

Uh, first of all I want to warn anyone in Bed Stuy that IDT energy is coming around doing door-to-door bait-and-switch. Here are a couple of consumerist posts that explain what IDT is all about:

http://consumerist.com/consumer/idt-energy/

But you know, it got me thinking about whether it’s worth it to look for a different energy supplier than Con Ed and Keyspan. Anyone else have a positive story to tell about switching suppliers?