One of my initial bugbears when switching to WP8 was the lack of a SIP client app. I was using SIPDroid on an android handset, so that's the sort of functionality I was looking for.

At the time I just learned to live without one, but recent discussions around this got me thinking about it again and a quick google reveals that there is now a Linphone app that looks promising. I plan to have a play with it over the weekend, but anybody have any thoughts or experience with it already? Any others I should look at?