Thanks. I did this last week and it's a definite improvement. I have the original 40GB fat PS3 and swapped in an Intel 120GB SSD. There's no delay in navigating through home screen options now. Level loading times are reduced (obviously).
Is it worth $100 though? meehhh, not sure. I might have went a little overkill as I could have gotten away with a 60 SSD ($80?) easily.