comparison of various fests' rules
In the HP fandom, there are a bunch of exchanges that have essentially the same setup, all based off the Smutmas model. Mine is definitely one of them. Fests of this type are very popular -- obviously something about this setup works well for the HP fandom. But because I'm a geek, I think that one of the most interesting things is the slight differences in the community rules.
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The way a moderator chooses to format their rules is interesting to me, and I always try to browse around and check out other community rules before revising my own each year. Some rules are very casual, in a "hey, guys, let's have a fic exchange!" way, and some (like my own) are much more formal and rigid. For me, I hoped this would signal to participants that the rules are set and not to be messed around with. Other mods may be hoping to send the message that they are friendly and available in case of problems -- which I usually try to convey later, after everyone is suitably cowed. ;)
Overall, of course, every mod has to make the rules that work best for their personality, their participants, and their specific exchange theme. There are not a lot of big variations in these fests, so little things become the difference-makers. Every once in a while, though, someone will come up with a breakthrough concept and I'll have to snag it and incorporate it into my own fest. :)