On the site of adobe I found following statement:
"SteadyMovePro stabilizes image sequences. It is an advanced version of SteadyMove, which ships with Adobe Premiere Pro, and provides additional controls that allow you to get just the result you want."

I"m not sure if it ships with the premiere/encore bundle and allready send a mail to adobe's support but no answer so far. Does anybody know if this is the case and were I can find the plugin on the cd?

Steadymove (the non-pro version) shipped with Pro, and with Pro2. It 's in a folder labelled "Third party software" or something similar.

Not sure if it ships with CS3....