The moderator of PS3 Forums, "The Unofficial PS3 H.Q." has posted the following:

Apple + Sony = PS3

I am now hearing stronger rumors that Sony is indeed working with Apple on the PS3. Most of this work is based around support for iTunes and iPop on the PS3.

iPod connectivity - Ability to connect the iPod to the PS3 and play it's music through the PS3 to your stereo or other audio playback devices. Will also provide some graphical effects on your TV during playback

iTunes linkup - Access iTunes and your music through the PS3. Purchase and download additiona tracks through the PS3. Wirelessly play iTunes music from your PC/Mac through the PS3

Sync support - Use the PS3 to sync your iPod with iTunes, no need for a PC or Mac to sync and add/remove tracks and organize playlists.

Apple may also be helping Sony with some UI design for the PS3 dashboard interface. No links, and for that I appologize, but I figured people would like to hear this information anyways. If the rumors hold true, this would be mutually benefitical for Sony and Apple in a lot of ways.