The file format is SVG, a W3C standard and, in my experience, the best tool for viewing and editing them is Inkscape, but any SVG editor should do the job.
Warning: for viewing in the web browser, at the moment the best option is the brta release of Firefox 3, as previous versions have problems displaying advanced SVG features.
playing cards ()
Download all SVG galleries as one tgz (Tar + Gzip) file: all_svg_nicu.tgz (5460.25 Kb)
or go inside any gallery in order to download it as a single tarball (Tar+Gzip)
see also my main Cartoons repository.