This list is a joke.
$.
{
Datacoin sounds like a neat idea, but i put it right up there with solar powered cars, because its just plain impractical.
}
{
Mastercoin is a scam/serves no real purpose, and cannot survive without bitcoin.
}
{
Namecoin was a cool idea that is ultimately going nowhere.
}
{
Protoshares is a hype bubble waiting to implode, with a possibility of launching mini scamcoins within its blockchain in the mold of Mastercoin
}
... shall i continue?
We meet again!
I like the cut of your jib