Looking for compact but flexible, simple and cheap development board? You should consider this nice list of microcontroller USB-Stick tools. These are special development tools that include all necessary hardware and software in a portable USB stick. Most of them consist of two parts – USB stick and attachable target board. For instance eZ430-RF2500 is the world’s smallest low-power wireless development tool. At only $49, the tool includes a USB emulator to program and debug your application in-system and two 2.4-GHz wireless target boards featuring the highly integrated MSP430F2274 ultra-low-power MCU.