This is an alternative start page for Chrome.
On the main pane you will have your bookmarks taken from the Bookmarks Bar. To put new sites there, just bookmark the sites as normally - into the bookmarks bar.
Below it are the Chrome Web Apps. There is also a possibility to add your favorite news feed to the page.
This uses Flickr for the background photos. You can also specify your own background with an url.
Start! is a nice idea but it can get messy when a large selection of bookmarks are added.