Alternative activity monitors for OS X?
iStat Menus and its free Dashboard widget version iStat Pro can show you a good broad overview of your Mac's systems, but I'm afraid I don't know of any monitoring utilities that show individual application processes (ie Finder activity copying files) other than shell tools like lsof or top.

edit I had forgotten about good old fseventer - last updated in 2010 but still working on 10.6.8.