Why is my Huawei IDEOS X3 (U8510) not appearing in the Device Manager list?
Alongside installing the correct dirvers, I've found that you may need to also do a bit of manual setup so that your computer can recognise the usb device.

Try this: find the .android folder in your home directory, and replace the adb_usb.ini file with this one. this tells your computer to let adb work with a load of different usb devices. You may need to restart ADB via the command line:

adb kill-server
adb start-server


and now adb should show you your device

adb devices