We are making some great progress at Lypp these days. Last week we unveiled our new mobile app at Lypp.com (built on the Lypp VoIP API of course), today we released our Ruby on Rails VoIP Plugin. Here are some details taken from the Lypp Blog.
Within an hour you should be able to create a voip widget and make your first call from your application, no joke. Email api AT lypp.com for a username and password.
Stay tuned for the VoIP Mashup Contest we will be announcing soon!