VoIP-news has The Top 25 VoIP Innovations of 2007. Number 1 is Microsoft's OCS. Huh? Switchvox hosted solution was 3. FMC hardware from Avaya and others. The ability to use a Desk Phone was big this year. Also, disposable numbers beat disposable email addresses (unless you consider that many Y! and Hotmail email addresses are disposable).
This list of Top 50 Open Source VoIP Apps from virtualhosting.com includes SIP Proxies, SIP Clients, H.323 clients, IAX clients, PBX and IVR Platforms, Stacks and Libraries, and Developers. Most of this list has been around for a long while, like OpenSER and VOCAL.
Check out both lists to see if you missed anything.