well, I guessing you have 'software update' updated. Which might suggest, that whilst 'ps3 media server' is supported on leopard, perhaps only on intel systems.
If you want to pay for the software, I would consider contacting the developer -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/g3-5-list
