I hope you guys were serious when you said that acid-free scrapbooking markers were ok to use on fondant that is going to be eaten. I have heard some weird things... but that is something else! Since those God-forsaken foodwriters stink so bad, I bought a set of the scrapbooking markers to try that out. They are really nice, but not cheap, that's for sure!! Someone please reassure me that this was not some sort of crazy joke... and if I use them, I won't kill a hundred people!! 
Melissa, contact the manufacturer and ask them about toxicity. You know the routine. You are going through it with your roller research. Just because something says it is non-toxic does not mean it is edible. It does not mean that it will not cause gastric distress of any kind. And there are some people out there who do eat fondant. And please let me know what you find out.
Theresa 
I know, I know, I thought it was insane, but read this thread...
http://www.cakecentral.com/cake-decorating-ftopict-96021.html
Don't worry, it's a short one!
I do not like the Wilton markers either. I had the same trouble with them, like it was already dried out. I have not tried the Americolor pens, so I cannot comment on them.
Another option to consider is filling a water pen (also known as a water brush) with thinned airbrush color instead. Of course, you would thin it with a high-proof (high alcohol content) liquid.
Water pens are not very expensive, and are available in most craft stores, and literally in all art stores. They come in several sizes, so fine lines would be possible for outlining.
Theresa
Non-toxic is not the same as edible, and I honestly wouldn't use them on the fondant that is consumed. The manufacturer will tell you the usual...They are not FDA approved for consumption. Same as non-toxic chalk that is used to decorate gumpaste flowers, etc.
It is so important when selling cakes to follow regulations, and I can safely say that using scrapbook markers is not a good idea...maybe on specific items that can be detached from the cake, but never on the actual fondant that could be eaten. They do sell very nice edible markers that work beautifully, and I would go that route if you're selling your cakes.
Just my thoughts.
Good luck.
Angie
I have to say that I really dont think they are intended for consumption. It might be okay if you are making a name tag or plaque or something that will be taken off the cake and not consumed. I mean kids markers are non toxic, but they dont write on the package that it is okay to eat them. There are plenty of non toxic things laying around the house that we dont want to consume.
You want a PMA certified non-toxic marker. See this thread...
http://www.cakecentral.com/cake-decorating-ftopict-81601.html
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