I was looking for a way to prevent the animation into and out of Activities. Here is what I found:
To prevent the default slide animation on Activity.finish() I found the following to work on 1.6. I am not sure what other versions it works on.
For animation into a new activity for 1.6 is done the following:
int FLAG_ACTIVITY_NO_ANIMATION = 65536;
Intent intent = new Intent(your.class);
And for 2.0 and above, Intent.FLAG_ACTIVITY_NO_ANIMATION should be used.