Free conference calling services are just so darn useful, whether it's for a business conference call or just to chat with all your friends or relatives at once. LiveOffice Free Conferencing ups the ante in the realm of free features: once you register with the site, you can set up conference calls with up to 250 participants. Conferences don't require reservations, and can last up to 6 hours. You can opt to have your conference recorded (by dialing 5* any time during the call.) When the call is done, the recording is delivered to you in MP3 format — again, at no charge. Sweet.