EVoice - a virtual phone receptionist for business voice mail. Forwards messages to any email address you choose.
Packet8 - Our home phone line runs through Packet8. We can listen to voice mails as email attachments, as well as delete voice mails online!
Skype - it's free to download, and free to call other people with Skype. Plus, if you upgrade, you can call almost any number, anywhere in the world, from any computer.