Reminder: The Spell Contest Votes are ending tonight and the Wallpaper Contest is still running :)
Hydra Thriller by SkeleBlade
Just ... LOL!
Chain Lightning Tutorial by ProzaicMuze
A very interesting tutorial written by ProzaicMuze explains how to make a chain lightning using the Data Editor. Instead of using the common Missile and Marker combination, he chose to use Target Sort. This technique allows more flexibility, for example you can chose to focus units with the lowest life first or easily transform it into a healing wave.
Turn Based Combat by Hamstroman
Since you are good geeks, you probably played some board game RPG. Hamstroman made a concept map attempting to bring the same gameplay in Starcraft 2. So far this is the best implementation I've seen. The author is waiting for feedbacks on the concept and how to make a full map out of it. Feel free to give your opinion :)
DNA Wars by xenrathe
xenrathe has been working for some weeks on DNA Wars, this is a bit like the previous one but in real time. You've got a hero that goes faster than light and your mission is to kill the opponents by deforming the terrain under them. He is no longer working on this but decided to make a small video to show it off, who knows, maybe one of you is going to use the concept to make a cool map :)
Hydra Thriller FTW! XD
Makes me wanna play Heroes again :(