It currently supports a wide variety of AVR chips, including the 28-pin ATmega48/88/168/328 series, the 20-pin ATtiny2313, and many 8-pin ATtiny devices (such as the ATtiny25/45/85 and ATtiny13A). A
list of supported devices is in progress, but the Rescue Shield supports many more devices than those listed on the wiki.
The hardware implements all of the control lines to support flash programming, but the code just isn’t there. If anyone would like to volunteer to rewrite the code to support more features, such as general flash programming, please post in the
support forum!