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[polycarbonate1 <polycarbonate1@xxxxxxxxx>]

Good news. I'm in OS X now after just having done this http://www.apple.com/downloads/macosx/apple/firmware_hardware/batteryupdate14.html
As well as the power supply getting extremely hot, and short battery life, I was suffering from my batteries not holding their charge properly. I always keep my spare battery fully charged, and found it dead flat the other day after having been out for a week. Also suspended my machine recently with a full battery on Friday only to find it hibernated on Monday morning because the battery was dead. I believe both issues to be related to battery firmware. Haven't actually done any tests yet without a battery; if anyone would care to do so, please report your findings. The good news is that rebooting to Ubuntu cuts battery time to 2:30, but rebooting back to Leopard, it's still 4:30. System's been up for a good 5 minutes now, and the CPU is still on at 40ºC; it would normally be getting fried by now. The CPU itself generates very little heat unless I'm rendering video, the power supply just heats everything else up.
SMC version: 1.13f3
Battery information:
Device name: ASMB013
Pack Lot Code: 0001
PCB Lot Code: 0000
Firmware Version: 0102
Hardware Revision: 0300
Cell Revision: 0200

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WARNING: Intrepid might burn down MacBook Pro
https://bugs.launchpad.net/bugs/262550
You received this bug notification because you are a member of Mactel
Support, which is the registrant for Mactel Support.

Status in Mactel Support: Confirmed
Status in Ubuntu Release Notes: Confirmed
Status in “linux” source package in Ubuntu: Fix Released
Status in linux in Ubuntu Intrepid: New

Bug description:
Binary package hint: linux-image-2.6.27-1-generic

Testing Ubuntu 8.10 Alpha 4 64-Bit on a MacBook Pro rev. 3. Installing today's updates, the MacBook gets extremely hot and automatically goes into standby. This looks like an emergency standby caused by the EFI or something because it got overheated. Unless you put a metal plate or something under it, the fan runs on highest level at full power, which is not the usual.

Is there a tool you can see the CPU temperature with?