Create another gmail account and use that. You'll have to spend some time doing the log-out-log-in-as-new-account shuffle, though. Google are very keen on having you use one account for everything.
Gmail does let you set a new email address on a gmail account; it's possible that that new address is the one that appears to the world if you post with Google Groups.

Log out of gmail. Go to google groups and create another account with any email address.

The problem is if you're logged in to gmail, you have to log out and log in with the other account to view the groups.

Hope this helps.

Wow, that sucks tremendously if there's really no way to do it.

I tried logging out of gmail and creating another account. When I do, it tells me an account already exists for that email, and I should just log in. :-(

https://www.google.com/accounts/ManageAccount?hl=en

Does that do it?

That page shows my email address, but doesn't seem to provide any way to change it. :-(

Try logging out and deleting your cookies, and then using a different email to sign up. (You'll probably have to change all your login info--new username, etc..) (Which seems to be what shalabh said, also, except for the delete cookies part.)

This might be what you are looking for:
http://groups.google.com/support/bin/answer.py?answer=12346&topic=251

Did you have an Orkut account with a non-Gmail address? If you do, trying using that one and your Orkut password.

I use a non-Gmail account for both Orkut and Google Groups, and it is indeed annoying that they make you log out of Gmail each time.

-K

Interesting. The steady stream of "Google is good. Google is great." never seems to end across the internet, but there is an increasing number of hintings towards Google breaking their "do no evil" motto. I'm not saying I have a problem with them trying to keep their services tightly knit, and I even think they are far too disconnected (Reader and GMail and Groups should combine interfaces!), but its an interesting shift to watch.

Robert: the subscribing by email technique worked! Thanks.

Looks like you've already solved the problem, but, just for the sake of getting solutions out there, I'll mention one more possible way of subscribing without a Gmail account. I *think* the "subscribe" forms directly on the Django community page may let you do so.

Adrian, thanks. I saw that subscription form today (sheepish grin), but I'm glad to have a way to do it for any group.

Most or all Google accounts work with Google Groups; switching is a nuisance, but they work.
I have a Gmail account and an older account that I use for posting through Google Groups, made for the web service API beta test of some years ago (when Gmail didn't exist). When I check Gmail before visiting Google Groups I have to log in as the other account before posting; I've also noticed options are separate for each account.
I think this is a normal kind of integration ("Your browser is accessing all Google services through this account until you log in differently"), easy to understand but not too smart; a way to link accounts in some Google configuration to automatically use account A for Gmail and account B for Groups would save some logins but erode user privacy.