A welcome page or a portal would probably be a good idea if someone was willing to set one up for classes using Wikipedia. The biggest problem I've seen with class projects is the mass insertion of copyrighted material, which is bad for us and bad for them since you'd expect college students to understand the ramifications of plagiarism. So any welcome page should explicitly spell out the copyright issue. Also I think we should recommend that they contribute as registered users so that any copyright issues can be attributed to one user, and if they are getting credit for their contributions they can be penalised for plagiarism.
--Peta
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