I dont have much time to discuss this right now, but here is a good website on the dangers associated with aspartame consumption.
Aspartame is, by far, the most dangerous substance on the market that is added to foods. Aspartame accounts for over 75 percent of the adverse reactions to food additives reported to the US Food and Drug Administration (FDA). Many of these reactions are very serious including seizures and death as recently disclosed in a February 1994 Department of Health and Human Services report.(1) A few of the 90 different documented symptoms listed in the report as being caused by aspartame include:
Headaches/migraines, dizziness, seizures, nausea, numbness, muscle spasms, weight gain, rashes, depression, fatigue, irritability, tachycardia, insomnia, vision problems, hearing loss, heart palpitations, breathing difficulties, anxiety attacks, slurred speech, loss of taste, tinnitus, vertigo, memory loss, and joint pain.
According to researchers and physicians studying the adverse effects of aspartame, the following chronic illnesses can be triggered or worsened by ingesting of aspartame

2)
Brain tumors, multiple sclerosis, epilepsy, chronic fatigue syndrome, parkinson's disease, alzheimer's, mental retardation, lymphoma, birth defects, fibromyalgia, and diabetes.
http://www.nexusmagazine.com/articles/aspartame.html
This is to add from that comment i made in the other thread, this isn't the source i originally read and yes i realise it's not saying *exactly* what i said in the other thread. Untill i can find that study then it will remain non-factual evidence, that's cool, still an interesting thought though.
Most artificial sweeteners are increasingly considered to be unhealthy for the body. Aspartame is the technical name for the brand names NutraSweet, Equal, Spoonful, and Equal-Measure. Aspartame, which is frequently found in diet sodas, accounts for over 75 percent of the adverse reactions to food additives reported to the FDA. Many of these reactions are very serious. In addition, Aspartame suppresses serotonin production, the chemical in the brain that contributes to your feeling satisfied after a meal. The end result from ingesting Aspartame, just as it was from people eating fructose, is that people are less satisfied with their food and tend to eat more. Diet sodas may actually be increasing your total intake of calories.
Finally,
artificial sweeteners in general, just like real sugar, give you an intense experience of tasting something sweet, which psychologically stimulates cravings to consume even more sweet tasting things.
http://www.ahcenter.com/manhattan-ny-hypnosis/articles/recover-Feb-Mar-2005/features/feature2.html
And from a cancer site,
The three major artificial sweeteners—cyclamate, saccharin, and aspartame—have been associated with health risks. In the 1970s, cyclamates and saccharin were linked to cancer, although the data were not strong enough to cause outright banning of these substances. Aspartame, made of the amino acids aspartic acid and a modified form of phenylalanine, has been associated with mood changes, insomnia, and seizures.
http://www.cancersource.com/LearnAboutCancer/core/print.cfm?DiseaseID=1&SubjectID=5&TypeID=2