A further note on kosher gelatin: Jell-o is considered Kosher. Here's some information on that decision:
"JELL-O Brand gelatin is certified as Kosher by a recognized orthodox Rabbi as per enclosed RESPONSUM. In addition to being Kosher, Jell-O is also Pareve, and can be eaten with either a meat meal or a dairy meal."
They included a sheet with a copy of "The Halachic Basis of our Kashruth Certification of Atlantic Gelatin and the General Foods Products containing this Gelatin" by Rabbi Yehuda Gershuni & Rabbi David Telsner. The upshot is that since the collagen has been taken apart by the chemical digestion and a new substance has been produced it meets the specifications of the Orthodox Dietary Laws and is Kosher and Pareve." (From: http://users.rcn.com/sue.interport/food/gelatin.html
So, basically, the reason that Jell-O is considere Kosher is that it is so far removed from the original animal product itself, that it can be considered a different product altogether, and can, therefore, be considered kosher.
However, from a vegan or vegetarian standpoint, it is still considered an animal product. So, if something says 'kosher gelatin', that just means that the gelatin has been certified kosher, but it does not mean anything regarding the source of the gelatin.
This brings up two important points for veg*ns: just because something is kosher does not mean it will necessarily adhere to the standards of being 'non-animal sourced' that you would apply to your food choices. Conversely, just because some items that have the "D" symbol on them (which indicates that it contains Dairy, according to the rabbis who inspected it) does not mean that dairy is one of the actual ingredients. Rather, it means that the product was produced on equipment that also was used to produce dairy products. (I'm not very well-versed on Jewish dietary laws, but I understand that their dairy plates are supposed to be kept separate from other plates; similarly, factory equipment used to produce dairy items is considered a 'dairy plate', and so anything produced on it is considered to have been produced with dairy.)
So, in short, it's a good idea to read the ingredient label to find out what's actually in the product. Jewish dietary law symbols can be helpful, but they are not exactly the same as what some veg*ns would follow in their own food guidelines.
And I'd be glad to hear more about Jewish dietary laws from someone who is familiar with them, but that's probably the subject of another thread.