Never liked jpeg, I can't stand the artifacts it leaves behind in my wallpapers. I'll probably still continue to use png well into the future, and don't really see any reason to change. After all, theyre lossless images, a few extra kb doesn't worry me nearly as much as a bleeding-edge, unsupported file type. Maybe in 10 years or so when images reencoded as video to save space is considered a commonplace practice, and lots of applications support loading .png.avi and .png.mkv files as pixmaps, I'll make the switch. until then, its an image format, and at the end of the day, my images are still lossless and support transparency, so I'm happy.