I just found out how to do this for the G9, so I thought I'd document it here.
1. Write an empty file to the root directory of your SD card named "vers.req".
2. Insert the SD card, then start the G9 by pressing the Playback button in "review" mode.
3. Hold down the "Func/Set" key, and press the "Display" key. The first time will show the version of the firmware on the G9. While holding down the "Func/Set" key, the 2nd press of the "Display" key will show the some other info, and the 3rd press is the one that will show the total shots taken. 
Found the info in the CHDK Wiki.
As in other Canon PS case, the ver.req file works as well in this model. Press FUNCSET and DISP simultaneously: It shows the following:
Canon PowerShot G9 P-ID:315A PAL D Firmware Ver GM1.00D NoError Jul 23 2007 08:05:13
subsequent press of DISP (while still holding FUNCSET) reveals:
Adj Ver.008.005 IS Firm Ver. 3.00 IS Param Ver. 2.03
If you use vers.req instead of ver.req at the last screen you can see more info:
Total Shoot : 26 <=- variating Open Shutter : 0 Close Shutter: 0
If you power on in PLAY mode without ver.req on the SD card and press the FUNCSET and DISP buttons simultaneously, the screen shows:
Firmware Ver. 1.0.0.0 [ OK ]
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