Is My Temperature Too High?

I've been noticing the fan on my PowerBook G4 (1.25G DDR SDRAM) kicking on a LOT lately. Especially when I visit YouTube, or other things that seem to require a lot of resources. This is pretty new, however.

This morning I was ripping a CD into iTunes, and the temp. monitor application I am using showed the follow settings:

Power Supply Bottomside: 138.7
Processor Bottomside: 144.1
Processor/Controller Bottomside: 144.9

The other night while watching a DVD I hit these numbers:
Battery: 102.2
Power Supply Bottomside: 151.7
Processor Bottomside: 143.6
Processor/Controller Bottomside: 146.3

Is it getting too hot in there? Is this normal? My fan kicks on for Photoshop, FLV videos, and now ripping CD's. Any ideas?

You may want to look in the vents and see if there is a buildup of dust in or around the fan area. Sometimes when this gets clogged up it can cause the laptop to heat up more, causing the fan to kick on more often.

Any suggestion on the best way to clean the vents on a PowerBook?
Should I just take some canned air to it?

If your computer hasn't shut down from heat, then you are fine.
The fans coming on are NOT a reason or call for alarm or concern.