With what frequency should I discharge and recharge my macbooks battery?

I use my Macbook as a desktop replacement and often am at home and therefore near to a wall socket; but how many times a week should I run the macbook from batteries to keep the battery healthy etc.? And when I do run it from its battery, should I let it discharge all the way till 0%, or plug it back in at 10%? 20%?

Well, yes once per month is sufficient. However, they can be re-calibrated more frequently without damage but with a slight reduction in total useful life (as limited by the lifetime number of charging cycles.) BTW, this is not specific to the Apple batteries but to most all lithium-polymer battery paks.
I might also add that the charging circuitry in the MBs and MBPs shuts off when the battery charge reaches 100 percent and does not start charging until the battery charge drops below 95 percent, so you can leave the battery installed even with the A/C adaptor in use without concern for either overcharging or overcycling.

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    com.apple.driver.AppleHPET    1.5
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    com.apple.iokit.IOHDAFamily    2.0.8f3
    com.apple.iokit.IOAudioFamily    1.8.3fc2
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    com.apple.driver.ApplePolicyControl    3.0.17
    com.apple.iokit.AppleProfileFamily    41
    com.apple.driver.IOPlatformPluginFamily    4.7.0a1
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    com.apple.driver.AppleBacklightExpert    1.0.2
    com.apple.iokit.IONDRVSupport    2.2.1
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    com.apple.kext.ATI6000Controller    6.4.2
    com.apple.kext.ATISupport    6.4.2
    com.apple.iokit.IOGraphicsFamily    2.2.1
    com.apple.driver.AppleThunderboltDPInAdapter    1.5.9
    com.apple.driver.AppleThunderboltDPAdapterFamily    1.5.9
    com.apple.driver.AppleThunderboltPCIDownAdapter    1.2.1
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    com.apple.driver.AppleUSBBluetoothHCIController    2.4.5f3
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    com.apple.driver.AppleUSBMultitouch    207.7
    com.apple.iokit.IOUSBHIDDriver    4.2.5
    com.apple.driver.AppleUSBMergeNub    4.2.5
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    com.apple.iokit.IOBDStorageFamily    1.6
    com.apple.iokit.IODVDStorageFamily    1.6
    com.apple.iokit.IOCDStorageFamily    1.6.1
    com.apple.driver.XsanFilter    402.1
    com.apple.iokit.IOAHCISerialATAPI    1.2.6
    com.apple.iokit.IOSCSIArchitectureModelFamily    2.6.9
    com.apple.driver.AppleThunderboltNHI    1.3.2
    com.apple.iokit.IOThunderboltFamily    1.7.4
    com.apple.iokit.IOFireWireFamily    4.2.7
    com.apple.iokit.IO80211Family    320.1
    com.apple.iokit.IONetworkingFamily    1.10
    com.apple.iokit.IOUSBUserClient    4.2.4
    com.apple.iokit.IOAHCIFamily    2.0.7
    com.apple.driver.AppleEFIRuntime    1.4.0
    com.apple.iokit.IOHIDFamily    1.6.6
    com.apple.iokit.IOUSBFamily    4.2.6
    com.apple.iokit.IOSMBusFamily    1.1
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    com.apple.security.TMSafetyNet    6
    com.apple.driver.DiskImages    289
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    com.apple.driver.AppleACPIPlatform    1.3.6
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