Google Analytics During Development

Google Analytics is an awesome service that gathers data about traffic data to and on your site and displays it in sweet fashion with graphs. The problem is that during your early deployment and or development phase you will be responsible for most of the traffic and distort the data by quite an amount.

Especially if you do offline advertisement (distributing flyers, posters, etc). you will want to an estimate idea how many people visit your website due to that (probably inefficient) advertisements. Under you google analytics account you will find the numbers under 'traffic sources/direct traffic'.

Since most of the direct traffic, the one without referrers, will be generated directly from your development machine, I was wondering if there was a way to tag your own generated traffic or never gather it at all. Any ideas?