This is one of those things that people tell you to do but you never do. I never would have done it until we moved into a home that already had them in some rooms. I have had to replace every regular bulb in my house in the last two years except those and when I replaced the regulars for flourescents, my light bill went down to what I used to pay in an apartment. Next time you replace a dryer or stove. Buy a gas one.
Some services come with voice mail and everything.
I know several people that have done this and tell me it works wonders. Cut all that call waiting and caller ID crap. Monitor the long distance bill like a hawk. This stuff works with some families. Keep the cable.