I picked up the MGS4 bundle a month ago and the fans are noticeable too. I bought the MGS4 bundle and a 40GB PS3 for my dad as a Blu-Ray player. Comparing the two, the 40GB is much much quieter and cooler than the 80GB.
I think it's just an unfortunate circumstance since the 80GB PS3s use older 90nm tech instead of 60nm with the 40GB PS3s, so they dump out an extra ~60W worth of heat and the fans need to keep up.
Had I known what I know now, I would have purchased the 40GB PS3 instead, backwards compatibility be damned.
Maybe I'll swap PS3s with my dad... :evil:
What model PS3 do you have?