How you i upload multiple resolutions? Do i make multiple uploads with different resolutions specify in the AP guide and submit them?
Sounds like a dumb question considering a lot of people know how.

You don't actually (not yet any way).

The site automatically generates all the other resolutions that you see in the links. Ie, if you upload a 1600*1200 wall it will create the 1024*768, etc res versions automatically.

Eventually you will be able to upload versions with different aspect rations, but that's a little way off I believe, so it's not worth worrying about for now :).

If you're wondering about your mokona wall, 1280*1024 is the lowest resolution supported in that aspect ratio, so you won't see any other links.

Thanks trismugistus for clearing that up ^_^

Ok... so that means if I made a 1600 x 1200 wall it will create a 1024 version ? sounds cool, does it affect the quality?

Slightly. No compression is perfect unless it is done at the source (i.e. .psd level).