There is so much misinformation in that article, I don't even know where to start. We discussed all the misinformation on glutamate in the MSG thread, and the same applies to aspartate. In short, aspartate does not cross the blood brain barrier, save via molecular pumps, which regulate the amount that goes into the brain. The amount of aspartate naturally in your blood is enough to kill every cell in your brain five times over. If your glutamate pumps are malfunctioning, you're dead anyways.
On Phenylalanine, those people with the genetic disorder already know they have it. Complaining that it is dangerous to one group is like rallying against the dangers of peanuts. The fact is that it isn't dangerous for the vast majority of the population.
On methanol: I have to call BS. If this was a problem, I would be blind or dead by now. Throughout my college years I drank a HUGE amount of diet soft drinks, and never had any problem. I have also had my share of diet drinks that have gotten too hot and had the aspartame break down. That is not pleasant to drink, because the sweetness is gone. Sugar free jello would not be sweet if the aspartame broke down. It is apparent that it didn't. Those drinks have to sit in 100+ degree weather for weeks before it breaks down. This is my experience from leaving a package of diet drinks in the garage for a month.
On DKP, this isn't a problem either. The tests he cited had the animals ingesting the equivalent of 3500 packets of sweetener per day. This is hardly a comparative test. Also, no-one would accept a GLP standard that included getting animals mixed up. It is obvious that the standards that were provided didn't include such statements. To say otherwise would be wholly asinine. I've had to deal with GLP, and I can tell you that that standard gives the term "anal" a whole new meaning. The tests have been reproduced dozens if not hundreds of times since then WITHOUT mix ups. Complaining about problems with the initial tests is a tactic of the AIDS deniers, and is beyond annoying. They act as if nothing has been done on the subject since 1983. The same thing is happening here.