I've updated everything. No problem with driver. Added android:debuggable="true" to the . USB debugging mode on. But still dont work. My OS is Win7, my device is Huawei.

Menu->Settings->Applications->Development->USB debugging uncheck -> check),and Eclipse should recognize it.
Update
I also have to close the emulator window (if I have running any), and this works for me all the time.
Check the USB-to-microUSB cable. I was using one that I suspect only charges battery power, but no data transmission. After changing to another cable, my phone successfully appeared under android device in the eclipse run window.
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