Batch upload different resolutions of an image to an album

[totalcollection]

I love the batch upload features.

Is there a feature that user can download different resolutions of an image? Or I have to uploads those types of resolution, too?

Let say, from bigger resolution to smaller,  I have one image of 1920x1200 resolution uploaded, can visitors generate their prefer resolutions like 1680x1050, 1024x768, 1280x1024, 1600x1200, and 800x600 to fit their screen? Can it be from smaller to bigger, too? Or do I have to first create all resolutions to make this possible?If so, what are the structures to make them linked?

???Is .zip / .rar file recognized?

Another Q:
I am pretty new at category and album, does this meant:

Transportation (category)
   Planes (album)
   Cars
   Motobikes
   Bicycles
   Ships
   Trains
   Mics

Or

Transportation (category)
   Planes (sub-category)
   Cars
   Motobikes
   Bicycles
   Ships
   Trains
   Mics

Which technique of creating wallpaper site above is better?

Can't continue till I got your reply. Thanks in advance.

[totalcollection]

sorry to bump. Any idea?