All of these get one thing right that the current and most of the proposed Haskell logos do not: they don't make any reference to the syntax of the language itself. Doing so seems to miss the point of a logo: it's supposed to appeal visually, rather than semantically. So I'd like to see some submissions that don't use lambdas.
Interesting how perceptions can vary. Of all the logos you linked to, only the Python logo is anywhere near visually appealing to me, and even that seems a bit much. Less is more (which incidentally is a concept that also relates very well to Haskell's powerful abstraction mechanisms), and that is doubly so in a logo. I want a logo that could be adapted to be used in a lot of different situations, from t-shirts to favicons to mascots, sometimes even with slightly different connotations and references. I want a logo that I could draw fairly accurately on a piece of paper in 10 seconds. And as such, I vastly prefer many of those suggested on the wiki to all those you've presented here. I think all of those shown here get all the things I've mentioned wrong. And the fact that others do it this way isn't really an argument either. Since when has Haskell ever does something just because everyone else does it that way? :-) Cheers, /Niklas