on the Tiles and the Zoomer dock just right clik on an empty spot and click on auto hide
for tabbed dock right click on an empty spot then click on tab settings then click on Positioning then put a ckeck in the box
to show dock as drawer....
Edit geuss I should have read past this >>> how to auto hide the object dock
do what he/she said below also Note under the General tab click on Performace Option and put a check by I paid for this RAM,
please use it ..... IF you have the RAM to do it ... if not leave or check the I have 256MB one.... and put slider to Recommended
all info is for OD+