I would recommend that you download all of the software listed here (iBrickr is optional) and store them in a single file. This way, you can direct your anti-virus software away from your ipod hacking tools which may damage them beyond repair.
Firmware 1.1.1 - Download
Firmware 1.1.2 - Download
Firmware 1.1.3 - Download
Firmware 1.1.4 - Download
Note - iTouch 2.0 Firmware costs $9.99 from the iTunes store. There is no direct download.
Firmware 1.0.0 - Download
Firmware 1.0.1 - Download
Firmware 1.0.2 - Download
Firmware 2.0 (5A347) - Download
PwnageTool MAC OS X 2.0.1 - Download
WinPwn Windows 2.0.0.3 - Download
ZiPhone - Best JailBreak Method for MAC and PC - Download
Independence 1.4 - Download