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Despite ten years of editing, Mathworld still looks amateurish—no surprise, considering Mathworld was put together by a mathematical amateur. It’s rife with errors, in both mathematics in scholarship. But Wikipedia is regularly edited by professional mathematicians, and it shows. (Hi, David!)

(The closest thing to Mathworld when I was an undergraduate was the CRC Handbook, back in the days when handbooks actually fit in the hand. I miss those log tables.)

Actually, MathWorld has no edge on reliability, at least for advanced topics. It was created mostly by Eric Weisstein, a former astronomer and amateur mathematician who had been collecting this information since he was in high school. Early versions on the web were absolutely full of serious errors (usually not in elementary stuff, but in anything a high school or college student might find difficult or exotic), and the errors have only gradually disappeared.

P.S. I hope you realize that the reason MathWorld disappeared for a year was because of some extremely foolish business activities by Weisstein. After signing over the full rights to the work to CRC Press when they published it, he later tried to sell Wolfram the electronic rights. Of course, CRC Press sued, and they were clearly going to win based on their contract with Weisstein, so eventually he and Wolfram settled with them. Weisstein has tried to explain/justify his actions based on a very unclear understanding of copyright law, but the moral is that before you sign a contract for your life’s work, you had better figure out what the contract means. (Sorry for the rant – it just bugs me that Weisstein describes this as “author’s rights” in the commentary you linked to, while I think a fair description would be that he tried to violate the publisher’s rights.)