I have recently switched to the Nokia N97, which being a new phone has quite a limited number of downloads made available, especially for wallpapers.
My suggestion would be to make available the old style of search i.e. serch by keyword/catagory NOT by phone model.
Some people do have the software / ability to adjust downloads to suit their own phone.
I look forward to a reply from admin.

http://phone.mobile9.com/i/nokia+n97/

If you look at the bottom of the page you can see the categories we have. For example from the gallery page: http://gallery.mobile9.com/ you can get to:

Themes:
http://gallery.mobile9.com/c/themes/1/ at the bottom of the page I can find "Symbian S60 5th Edition 360x640 Themes" Listed which is what the N97 uses.

Wallpapers:
http://gallery.mobile9.com/c/wallpapers/1/ where I can select the actual dimension (240 X 320 Wallpapers, 480 X 640 Wallpapers etc).

Ringtones:
http://gallery.mobile9.com/c/ringtones/1/ Where i can select mp3, wav whatever

The exception is software which is directly linked on the gallery page: http://gallery.mobile9.com/

Is this what you mean?