lpr-bash is a replacement for the "lpr" command found in lpr(ng), CUPS, and other Unix printing systems. It is implemented as a shell script. Originally designed to run on LinuxFromScratch, and later ported to gentoo, it should work with virtually any flavor of Linux or Unix, and maybe even Mac OS X.
Aprils Fools Day
Nice one :-)
Which clients are implementing the standard?
First, you mentioned clients to implement this new standard. Which ones?
Second, there ought to be a nice little utility to create such metalinks (as most people are too lazy to remember all those xml tags or even type them).
Otherwise, this is a great idea - should do a good job on download acceleration, too!