@Orbit: Pretty cool idea for a fantasy world. Probably even good for something like a Star Wars kind of setting. For any harder kind of science fictional setting I'd avoid it. The top is different because of the friction at the "south pole" and because it has a gravitational force operating on it from "north" to "south." For an object orbiting in vacuum, it seems aphysical. Don't take my word on this, but you may be able to work something similar out by having an unlikely extreme concentration of mass to the south pole. For a world with magic, though, just say it was the result of the Godwars or something...
This is clearly just a recommendation, you're the creator here, I'm just the kibbitzer.
@Jagged coastlines: This is a harder one. I'd say, probably start with a blobby mass. Peninsulas and inlets greater than about a quarter or more like a tenth of the "diameter" of the blob should be infrequent or even unique. An inflorescence up to a third of the blob size could be added as a unique, Europe-like structure. In general a peninsula greater than ten times as long as its smallest width should be pretty unusual, and generally only present at fairly small scales. This was the first thing I thought of.
The second thing I came up with after a great deal of thought(yeah, you could smell the wood burning, I'd probably get more done if I didn't think so much about other people's maps). What makes Musgrave's Multifractals work? Inhomogeneity. Your coastlines are fairly uniformly jagged. What I think might help is to vary that more. Some coastlines should be somewhat jagged with small bays and inlets, other patches should be seriously jagged with fjords, rias, frequent tidal lagoons(tectonically inactive -old- regions), and still others should be very straight, with only very gentle curvatures and the occasional small river delta and perhaps small inlets following faults(active -young- coastlines).
I expect the kind of fractal shape you have, self-similar to very small scales might apply better to high mountain areas.
This is even more just a recommendation. I've spent a long time trying to tame noise into good looking terrain with very limited success. So, hey...
Anyway, it is a good looking map, and your climate idea is interesting. That's why I'm offering so much "constructive" criticism. That and it's a personality defect...