My experience:

After seeing your post I gave it a try. Looks like an interesting concept. Unfortunately, my computer combination does not work with it. Specifically Linux_2.6.14->Firefox_1.0.7->FlashPlayer_7. It works fine all the way up to "Send to Printer", which then does nothing (although it SAYS it sent it to the default printer, there's no record of it in my print queue). To be fully accurate, I've never tried printing directly from a Flash application before, so I can't say if it's Flash or some other PocketMod website thing. The Linux version of Flash is a bit old, but that's what we've got to work with. I think a newer version is in the works ... maybe it's even out already in beta. Probably wouldn't hurt me to update my Firefox either (although Linux isn't necessarily prone to all the browser related security problems that Windows is).