PikiWiki, which opened to the public yesterday, is no ordinary wiki. Instead of collaborating with others to edit text-dominated pages, people can use PikiWiki to easily share media with one another in a scrapbook-like environment.
The coolest thing about PikiWiki is how well the company has pulled off its drag and drop interface. After you sign up for a free account and create a blank page, you can drag any file from your desktop environment straight into the browser (on Windows and soon on Mac OSX). The file will be loaded and formatted appropriately by PikiWiki automatically. For example, photos will be displayed in a reduced size and placed where you dropped them. Generic files will be represented by links. All loaded files will be uploaded to PikiWiki’s servers once the page is saved.