The Atmel QTouch Library is a royalty-free software library (GCC and IAR™) for developing touch applications on standard Atmel AT91SAM and AVR microcontrollers. Developers can use it to integrate touch-sensing capability into their applications by linking the library into firmware. The library can be used to develop single-chip solutions for many control applications or to reduce chip count in more complex applications.
You can download the library here.
Any reason why this library wouldn’t work using the Atmel processor but the TI Capacitive Touch Shield?
http://e2e.ti.com/group/msp430launchpad/b/boosterpacks/archive/2011/04/17/430boost_2d00_sense1.aspx
Or the Atmel library ported to a TI Processor (MSP430) and Touch Shield?
TI has their own free capsense library for mcu:s with and without the pin oscillation hw-features (the new msp430g2452 that comes with the boosterpack has the hw and uses the library), it is also free and comes with the sources http://focus.ti.com/docs/toolsw/folders/print/capsenselibrary.html