Back before graphical user interfaces on PCs and the rise of Web 2.0 and the Rich Internet Application you could tell a power user by their mastery of the command line.

It may have been typing ls in a Unix shell or dir at a DOS prompt but these guys knew how to get things done in the leanest, most efficient way. No redundant mouse clicks, no waiting for the translucency animation to rotate your menu options into view. Bang! and move on to the next thing.

Part of the beauty of Twitter is that it goes back to those days of terse interaction and great power.

When it started it was just a simple way to display your status and post messages to your friends (publicly with @ and privately with "d {username}") but it's started to become a lot more.

My first discovery was that I could pipe things to twitter - so I didn't have to do anything to publicize a new blog post but automatically pull from the sites RSS feed to twitter. I use twitterfeed for that.

Then I discovered there were other robots out there that I could send messages to and have things happen. Sandy (sadly now closed down) was an ever helpful personal assistant, gtFtr tracks my exercise stats, Kvetch lets me vent and my most recent discovery is TrackThis which lets me get updates on any FedEx, UPS, USPS or DHL package I have in transit just by sending them a message with the tracking number.

Twitter is also reducing the amount of time I spend in email, IMing and blogging. Rather than clutter up my inbox with one line emails I can use Twitter. I can use Twitter when I don't want to be distracted by the constant ping of Messenger. Rather than try and turn a 2 line blog post into something interesting I can tweet it. if I can't express myself in 140 characters then maybe I need to think more about the post.

In the same way that the command prompt made you more productive if you were willing to learn a few tricks (such as idiosyncratic syntax) Twitter is filling that space in the interconnected internet world... and it's allowing me to do it from everywhere - at my desk, on any web enabled PC or via my phone - it's bringing consistency of experience and incremental benefit to learning those tricks.

So how do you use Twitter as the command prompt for Web 2.0?