Fujitsu-Siemens Lifebook E-Series

Turn the notebook on its lid, plug out the power cord, remove the battery and the CD-ROM drive
Remove the screws marked below:
Open the lid as shown below and use a screwdriver to pull the plastic off the clip
You should now have removed the top plastic cover with the buttons on it.
Now remove the other screws to be able to remove the bottom plastic cover with the touchpad area
Here you can see the BIOS battery. Lift the keyboard and carefully lift the bronze sheet metal piece. (If you own the E7110, you need to remove a screw near the Firewire-port to be able to bend the metal sheet up. Thanks to Maris F. for this hint.)
Pull out the small plug and wait about a minute.
Assemble the notebook the other way around and smile. You just reset your BIOS password although Fujitsu-Siemens says you have to take your notebook to a service point to let it be done. (because the Lifebook E-series is so secure LOL )