Here's what Snopes.com has to say about aspartame, as of September 2003:
http://www.snopes.com/toxins/aspartame.asp

Doesn't make it any more true than the source you cite. Unless maybe you think Snopes is usually non-biased, acccurate, authoritative. Thirty qualified physicians speak out against aspartame; most (unquantified) others don't feel it's dangerous. Many I am sure have no-data-therefore-no-opinion, and some of us just avoid the stuff anyway on general principles.

There. That settles the issue once and for all, doesn't it.