1. Wikirage is a site that tracks the pages in Wikipedia which are receiving the most edits over various periods of time. Popular people in the news, the latest fads, and the hottest video games, Internet memes, zeitgeist, and trends bubble to the surface. Gives you an idea of what’s hot on media right now. The site also lists the top editors.
2. Online Video Alarm Clock: Wake up to your favorite YouTube video by setting it up as an alarm in this online alarm clock.
3. Blurtt: A web service that lets you send real postcards to your friends. Just create a postcard online or upload a design, pay $0.99 if both you and your friend live in the US ($1.50 for International mail) and send it. Other similar services.
4. CSS Bake: An amazing site showcasing the web’s most beautiful websites and CSS templates. A great place for designers to get inspiration and tips.
5. The Linux Gamers' Game List is possibly one of the most complete (?) list of games available for the Linux platform. You can search the list by publishers, genre, developers etc. Links to the game’s website are also provided.