You want to make this thing talk to that thing waaay over there? Try the SeeedStudio super-long range 433Mhz RF link bundle! They're claiming 2KM range for wireless data transport & remote control use!
This 315MHz RF transmitter/receiver set is a simple 100M remote-operation control link
Bluetooth! XBee! Arrgh - which way to go? Well, the Bluetooth Bee lets you jam a Bluetooth SPP module into an existing Xbee socket ed project!
It's Laser time boys (and girls)! The long awaited Laser Range finder from the Joe Grand/Parallax team-up is here! This sensor is able find objects and walls with ultimate precision and makes laser ranging technology finally affordable.
This high discharge LiPo is a great way to power any R/C, robotic, or portable project. This is an excellent choice for anything that requires a battery with a lot of punch.
This ATTiny24-based 433MHz platform is a remote sensor base. Add up to 4 sensors (analog or digital), and configure the board's broadcast schedule!