It's hard to imagine many things worse than a house full of mosquitos. If you need some help quelling an infestation, this Arduino-powered vaporiser can do the job on a custom schedule.
Instructables user jack1986 was having trouble sleeping at night because of all the mosquitos in his apartment. He bought an insect-repelling vaporizer to keep them at bay, but he was racking up a high electric bill by keeping it on all the time. His walkthrough details how he hooked the vaporizer up to an Arduino board so that it would only run at night, or in mosquito-friendly warm weather. It's a pretty advanced project, but if you know Arduino and mosquitos are keeping you up at night, this is a really cool way to get rid of them.
Remake the Mosquito Killer (Arduino) [Instructables]