IMac running hot?  How can I check temperatures

I have a 2008 aluminum iMac that seems to be running hot.  Have cleaned the air intake and vent.  Running Lion.  Is there an app or other method to access the temperature of the drive?  Several previously popular 3rd party apps could check temps and adjust fan speeds but I can't find any that run in Lion.  Any advice?

You could download the free iStat Pro widget which should give you this information (and a whole lot more):
http://istat-pro.en.softonic.com/mac

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