'Locate Me' not functioning at all (Original iPhone)

Hi
Since I've upgraded to iPhone 2.0 (and now 2.0.1 - I've not had a chance to upgrade to 2.0.2 yet since I've not been near my own computer long enough), the 'locate me' function in Google Maps (and, indeed, elsewhere), doesn't seem to work much at all.
In fact, it has located me only once since the update. Then, it took a while, and suddenly located me when I'd given up hope and wasn't paying attention. Then, it did a good job or keeping up with me, relocating my position every few seconds and generally looking better than the old 1.1.4 software.
However, since then it's not located me at all. As an experiment, I turned off the screen auto-lock, and left the phone trying to locate me (admittedly with WiFi turned off, but connected to a pretty strong EDGE signal), to see how long it would take. After an hour, I gave up. (I should note, however, that turning on WiFi still resulted in it not being able to locate me, I just didn't wait as long)
What could be wrong here? The locating feature was reasonably quick in 1.1.4, nothing physical has changed with the phone, so it must be something to do with the software. Location Services is turned on.
Any thoughts?

After a week or so of mucking about and reading up on the problem, I think I know what causes it and how to fix it. I have resolved the issue on my 2g iPhone running the 2.02 software.
From what I think I know:
Version 2 of the iPhone software uses a system called Skyhook to locate you as its primary method. In order for Skyhook to function properly, wi-fi must be turned on in your iphone settings. Contrary to what I orginally believed, you *do not* need to be connected to any wi-fi network, it just needs to be turned on. The iphone will then have a look around and find the wifi base stations local to you, and use the data connection in your iPhone to contact Skyhook and get the location of those wi-fi stations. Once the data has been returned to your iphone, you wail have a faux gps fix. If no wi-fi stations are available in the area, it will simply fall-back to the original cell phone triangulation method on the 2g iPhone to find you. But the whole think falls apart if wi-fi is not turned on. Remember you do not need to be connected or joined to someone elses network, the wi-fi on your iphone just needs to be turned on.
I think the bug is that if wi-fi is off, the Skyhook function doesnt get called, and the iPhone never falls back to EDGE/GPRS triangulation.
I have tested this with the my wi-fi router turned off in my home. The iPhone located me in about a minute on the 2g version with no connection other than edge. This also seems to match with the you-tube video.

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