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It's a simple concept: when you're viewing a web page, enter "smub.it/" in front of the "http://" and Smub serves up the screen below, making it super-easy to share the story right away via email, Facebook, MySpace, Digg, StumbleUpon, Twitter, Reddit, Delicious or Mixx. You can also bookmark the page on Smub itself.
For a quick example, click here to view this page on Smub.
It's a straightforward idea that could prove useful. Mobile Twitter users might also want to check out HOW TO: Use Twitter on the Go.