My slim's (250 GB)s' internal is getting somewhat low (< 100GB), I think it's about time for a larger one. I do have plenty (I think) music (~20+ GB), trailers/"how it was made" (Dev Diary), and since i'm collecting a small collection of blu-ray (weather they use BD-live or not).
Other notes: I do have 3.55 (K) . . . when I start netflix it tells me "system software of your PS3 system is 3.55. To start you must update to 3.56 or later . . ." & I seemed to have gotten a icon under music for the Qriocity service.