Removing yourself from the internet can be a tricky business. That old My Space account, or pictures on Flickr of your holiday in 2008 can be awkward to remove. And that's just the tip of a very big data iceberg for many. Whether you want to disapear completely or just remove some items, there are ways of going about this - some easy, some requiring quite a bit of effort.
This article has a very comprehensive list of dos and don'ts. Well worth a read.