The ThinkPad Advanced Mini Dock (Model # 250410U) contains basic pass-through connections for notebook ports, including power pass-through. It comes without integrated power supply but provides the same power jack as found in a ThinkPad, an AC-Adapter is included. Besides all the pass-through ports the ThinkPad Advanced Mini Dock comes with an On/Off switch, Key lock and a slot for a cable lock.
Some units can completely lock up your system when you lose power. This issue seems to be caused by the legacy ports (parallel and serial) on the dock.
You can work around this by disabling the legacy ports in the BIOS: Config -> Docking Station -> Legacy Devices on Mini-Dock
Note: This wont help if you put your system into standby. After resuming your system will be affected again (tested with ubuntu 10.10).
More information is available on this page (google cache, the original one is atm 404): http://www-307.ibm.com/pc/support/site.wss/document.do?sitestyle=lenovo&lndocid=MIGR-69370
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