sudo apt-get update doesn't actually update raspbian. It just downloads new package lists. A sudo apt-get upgrade is needed to update the packages. Additionally, you can use rpi-update https://github.com/Hexxeh/rpi-update to download the latest firmware and kernel.
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Whist we're talking how-tos, here's a guide that turns your Raspberry Pi into a Ninja Block: http://ninjablocks.com/blogs/how-to/7195040-using-a-raspberr...
sudo apt-get update doesn't actually update raspbian. It just downloads new package lists. A sudo apt-get upgrade is needed to update the packages. Additionally, you can use rpi-update https://github.com/Hexxeh/rpi-update to download the latest firmware and kernel.
Thanks jhenkens, I'll correct the tutorial.