I bought this one: Nano V3.0 for Arduino (Works with Official Arduino Boards) - Free shipping - DealExtreme
I ran the chip detector (actually had to remove md5 code to reduce the size of the binary, in order to upload)
This is the output:
Atmega chip detector.
Entered programming mode OK.
Signature = 1E 95 0F
Processor = ATmega328P
Flash memory size = 32768
LFuse = FF
HFuse = DA
EFuse = FD
Lock byte = FF
Clock calibration = BA
Bootloader in use: Yes
EEPROM preserved through erase: No
Watchdog timer always on: No
Bootloader is 2048 bytes starting at 7800
Bootloader:
7800: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
7810: FF FF FF FF 7F FF FF FF FF FF FF FF FF FF FF FF
...