nothing is being written for the PPC processor and after 6 years you have got your money's worth out of the G4.
While it will still function reasonably well, the newer iPhone/iPod/iPad require a newer edition of iTunes which will not run on the G4.
Well, Mac-sters...We need to know if we're at the destination of having to submit to Technology and purchase a more advanced system. We purchased our iMac PPC G4 (1.25 GHz w/ 256MB) back in 2006/07 and are now in a quandry of do we or don't we - purchase a new system for home use to use w/ phones, run the latest gadgets, & Apps??? What say you that may be in the dark ages like us or those that have bowed to the "machine" for a happier life..lol??