I love Twitter too. But when I speak of it around the workplace (information technology service people), most say: "what's that?"
I see its increasing growth in its application to status feeds on websites, and its benefit as a social media optimisation tool. Perhaps Twitter will simply be relegated to that: a search engine optimisation phenomena only utilised for website promotion?
We'll see. Meanwhile, I will continue to use ping.fm and watch which "status update" service (e.g. "Pownce") gets the limelight.