Lypp.com (site is not yet live) is a new group calling service set to launch a private beta in September. There are a lot of conference calling services out there already, not least among them being the full blown meeting applications (GoToMeeting, WebEx). However, Lypp wants to make initiating a conference call dead simple (download free) over IM, SMS, and email. The service will be free at the time of launch (each user will get 500 minutes of free calling, no per-min charges, no monthly fees).
IM will be the first mode for initiating conference calls. Users will associate an IM ID with their service and add Lypp as a friend. You’ll then be able to initiate a call by sending a command to that IM buddy, such as call [number, number, number]. Lypp will call your phone and those of your friends, connecting you all in a conference call. Most likely the calls are initiated and tied together over a VOIP bridge. Typing in my friends numbers instead of just selecting contacts on a downloaded application seems like it could get annoying, though.
They’re keeping it simple for launch, but have plans for an API, advanced in-call controls, recording, and possible location based. The API will integrate with calendaring, address books, and other complementary applications.