I'm using a 2.4 SR MBP with 4 gig ram, just surfing the web, email, etc. but nothing particularly CPU intensive.
My #'s:
hd: 35
cpu a: 48
gpu diode: 49
enclosure bottom:30
heatsink a: 43
heatsink b: 37
So your #'s seem a bit warm comparably. I have had other MBP's, including 2 1st gen units, and had similar issues. I went to the Genius bar, had an evaluation, and they always told me that the unit was 'within spec'. As long as it isn't overheating or shutting itself down, they generally assume that it is normal.
I have personally found that each unit seems to run at it's own operating temps, within the allocated specs of course, some warmer, some hotter, depending on how much thermal paste was/wasn't used, where u are using the mbp (ambient temp of the room matters) and whether u are blocking the parts of the unit that assist in heat dissipation.
I am using an ilap which tends to minimize the annoyance of the undersurface of the unit becoming annoyingly warm, but mostly, I have just stopped monitoring the temps entirely.