Not sure what you mean. There isn't a PVR for PS3, not without installing Linux/MythTV etc. It's also not a DLNA server, only a client.
I'm assuming though that you mean "is there a Mac PVR that will play nice with the PS3." I don't have any direct experience with that part, but Elgato may have something that suits Elgato - North America
The only trick is then getting the video to your PS3. You can just burn them to DVD or copy to USB key. Or use an application like MediaLink
to make your mac a DLNA server. I use it at home and it's pretty decent.