Tronixstuff has a borderline insane tutorial series going, and as of now, 27 chapters have been published. It's essentially the Arduino Bible, but the two most recent additions in particular have ...

A single seven-segment display might not be extremely useful, but with [firestorm]’s tutorial, it’s easy to give your Arduino some remote control capabilities with a simple IR receiver.

Arduino enthusiasts looking for a new project to keep them busy over the coming weekend may be interested in this open source Arduino cocktail maker aptly named the HardWino.