Yes, using the command line of iMouseFix
The command line version of mousefix/iMouseFix is working for me on 10.6 with the Apple MagicMouse (some of the other suggested solutions don't work for the MagicMouse). I can quickly move the mouse between displays, but also do fine work with a setting of 8.
/Application/mousefix/mousefix 8
I have added the following to my .profile as they suggest in the README
FYI, The binary download is mousefix.tbz2 at http://code.google.com/p/mousefix-10-6/downloads/list.
Also see the similar question at superuser - http://superuser.com/a/446200/66255