i have been doing some research on the d90 wobbly video effect and came across a very interesting plugin for the program virtualdub. I have had virtualdub for quite some time as i used to use it in processing avi files for astrophotography.
the pluging is called deshaker and looks to be worthwile for removing the well documented wobbles cause caused by fame skew as the camera moves around.
if you have a d90 or other camera that has this effect when shooting then this could very well help you.
here is the deshaker
and here is virtualdub
both are quite free.
I have seen samples and it seems to do quite a good job