Random useful and interesting sites

Found via StumbleUpon:

* Google sightseeing – a great way to see satellite photos of interesting world sites * Test everything – a jillion tools for testing the construction, seo, and other characteristics of your site * Computer Architecture – a one page primer walking you up from gates through to a complete simple computer. * graph paper creator. * Codswallop – one person’s view on the 100 simple web apps you need