Nimbuzz today released an update to their VoIP application for the iPhone. The new version adds the ability to make VoIP calls to landlines and mobiels via Skype-Out and Nimbuzz's major SIP partners, including Gizmo5 and SIPgate. Nimbuzz also works on an iPod Touch via wifi, essentially turning it into a VoIP phone.
iPhone users can also make VoIP connections without wifi over the 3G network using Nimbuzz Dial-up VoIP. This makes international calls much cheaper, by allowing you to dial a local number, then connecting internationally to over 50 countries.
Also in this version — Nimbuzz now allows you to post Twitter updates, making it a well-rounded, all-purpose communicator.