I downloaded some wallpapers for my phone using the PC. Now, in which folder of my Android phone should I store them in order to be visible in Wallpaper Gallery?
A quick solution : just copy them in DCIM (to use Gallery as a source) or store them in Picasa.
It'll allow you to get them from another handset if you want :)
EDIT (Thanks to Matt) : You can put the file in any folder of your FS, and Android will find it and suggest it as a wallpaper.