I've been using Spinvox on my iPhone for a few months now, and thought it worth a quick post. I'd always ignored Spinvox when it was shipped on my old Nokia's (on 3). Not quite sure why - but I've since learned how useful it is, after testing it prompted (in part at least) by this post from Mr Whatley.
It's a brilliantly simple tool: instead of you having to listen to a voicemail, Spinvox converts that voicemail to text, and then (err) texts it to you... It's a total godsend if you're in an important meeting and you're not sure whether the call coming in is more or less important than that meeting. A quick glance at the screen once it arrives answers that question. Nice.
Various friends and family have tried to trick the technology, and only barely succeeded. I'm now a fan - a bit like Sky+. Before you use it you don't know how useful it is. After you use it, you don't want to go back to your old ways.