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To act as devils advocate here, I'm going to agree with both sides and kind of go back on what I said earlier.
While it is true that in the example of dean_collins polls, the knowing of who voted for what is not a big issue, we have to remember that XOOPS is used on many large sites (some government, corportae, and large non-profit organisations) where it would become a real concern if it was known that peoples' votes could be identified. So I'm going to go back on what I said earlier and agree that such an identification should not be built into a polls module.
Re the IP address identification...true to some degree but tricky with the common use of proxy servers, multiple hosted servers where the server is one IP address but hosting hundreds of sites on a sub-net, etc. These days, it is quite hard to just identify exactly who someone is from the IP.
Ted