Hunted pretty thoroughly for this and haven't found any other mentions of it:
Does anyone know of a way to remove the "Sent from my BlackBerry� wireless device" auto-signature when sending from gmail through the Enhanced Gmail Plugin?
Although under the Email Settings menu item you can set Auto Signature to No, this is under an account-specific list of options, which doesn't appear when the gmail account is selected (you just get options for HTML, images and delivery/read receipts).
Any ideas?
(This is on an 8310 with Vodafone in the UK, should that be of any relevance).
Cheers for the pointer, although if I try to enter my PIN and IMEI from the PC, I get the message Your account is not accessible via HTML browser. Please use your device to access BlackBerry Internet Service, yet when I try to access the link from the blackberry it says The site cannot be accessed in this manner. Please use the URL or link provided by your service provider.