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This forum software (simplepress) is new to us too and we're learning as we go. Yes, I like the math problem too. I don't know why more sites don't use that instead of those hard-to-read captchas.
As for RSS – if you already use Google Reader, then you know how feeds work. Yes, you should be able to read this in your reader as well. What you get is all the forum posts in your feed reader.