Why does my computer keep freezing after waking from "sleeping"?

I'm running Lion (10.7.2) and frequently, not everytime, but often, the computer will freeze about 1-2 min after I've woken it from sleep – there are usually 1-2 applications open and then I can work for about a couple minutes and then it freezes and the only way to resolve it is to power it off w/ the power button and then restart.
I've got a late 2008 15" MacBook Pro, 2.4Ghz Intel Core 2 Duo, 4GB RAM – there is very little on the hard drive, but that seems irrelevant here anyway.
Thanks for any tips/help!

Intel-based Macs: Resetting the System Management Controller (SMC)

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    com.apple.driver.AppleGraphicsControl          3.2.11
    com.apple.driver.IOPlatformPluginLegacy          1.0.0
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    com.apple.driver.AppleSMC          3.1.4d2
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    com.apple.driver.AppleUSBMultitouch          235.7
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    com.apple.iokit.IODVDStorageFamily          1.7.1
    com.apple.iokit.IOCDStorageFamily          1.7.1
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    com.apple.driver.AppleUSBComposite          5.2.5
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    com.apple.iokit.IOEthernetAVBController          1.0.2b1
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    com.apple.iokit.IOHIDFamily          1.8.0
    com.apple.iokit.IOSMBusFamily          1.1
    com.apple.security.TMSafetyNet          7
    com.apple.security.sandbox          220
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    com.apple.iokit.IOPCIFamily          2.7.1
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    Welcome to the Apple Discussions!
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