My recommendation: An Open Source Skype replacement with more bells and whistles:
My idea of a Cool Portable App that'll Travel.
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I had a quick look at Gizmo and it seems that it would just need to be wrapped around the registry (around HKEY_CURRENT_USER\Software\Sipphone\Gizmo Project), but I don't think it's open source. It could easily be done though...
Rob Loach [Website] [Projects]