www.voipreview.com has ton's of information on making the move to VOIP, including service provider reviews and an up-to-date grid on service providers and their fees. Currently I'm leaning towards ViaTalk or PhonePower.
One other option I have is to go with T-Mobile@Home. I'm currently planning to update my cell phone plan when the new Google Nexus One is released. If I go with the Even More Plus plan, I can add the @ Home service for $10 a month, with no contract.