Probably the simplest way I can save a little money with a minimal change in services is to sign up for Vonage. Even the $15/mo plan is sufficient--we don't make 500 minutes of calls a month, and then there's better features and stuff anyway. My question to those Vonage subscribers out there, is when they say $15/mo (or $24.99/month) is that really what you pay, or are there other taxes and fees? I need to know to make a valid comparison.
I will say, this generally sucks. I think the best option is to continue with what I have, even if I could save a few bucks, because the transition costs will get me down, not to mention the hassle and aggravation. Then again, I'd like to get, say, HDTV service, and modern TiVo features.