Vista-style cursors can be downloaded here (white pointer) and here (black pointer). Unzip anywhere on your hard drive, right-click the .inf files and select "Install...". Then select the cursor at Start Button>Control Panel>Mouse>Pointers. One more reason NOT to upgrade to Vista. Still looking for a "red expanding circle at mouse-click location like in the Camtasia videos" which is (probably?!, I have no Mac) available for OS X but not for Windows.
Dirk Dot Net
Creator of useful things. Based in Chiang Mai, Northern Thailand.