Re:Dynamic screensaver
I've just been exploring this - it looks like you only get the option to create a screensaver if you select North America as your location. Other locations (at least the Euro ones I've tried) don't seem to provide the screen saver maker.
It is an incredibly slick piece of work from Nike. I think you could do this with SWFKit + SWFGen as long as it was hosted on an asp.net server. This allows you to generate customised .swfs online for download - at least I think it will.
Nike are definitely using Flash to power this and it is impressive that they allow you to upload the images via a dialog box. This is exactly the sort of thing that SWFKIt allows you to extend Flash to do. However, it is primarily for use via an .exe - i.e. a Windows program.
I've been able to get something similar working offline as an installable program, and SWFKit are currently helping me create an online version - I hope!
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