We released a new version of the Pololu AVR library today to add a few more features and fix up some things.
[li]A small fix to the baud rate generator used for serial communication and a fix to a broken RX interrupt in SERIAL_AUTOMATIC mode (thanks, Beers!)[/li]
[li]The analog-to-digital conversion functions now put the port into input mode and disable the pull-up resistor during analog-to-digital conversion.[/li]
[li]Better access to the calibration values of the QTR sensors or the 3pi line-following sensors so that you can do your own calculations, save them in EEPROM, check for sanity, etc.[/li][/ul]
The library seems to work with the latest version of WinAVR (20081205). Please let us know if you have any questions or comments.