i have an ibook 1.2ghz with 1.2 gb of ram and it runs fine, there is no 2 finger scrolling/right click. but there is a program called iscroll2 that i use that gives the ibook the same 2 finger scrolling and right clicking, but its tricky, first time i had it installed i would have to set the program everytime i restarted. second time i installed it ran fine and i never had to set it up after the initial setup
everything ran acceptably, there was some beachball spinning but not to much, flash is sluggish on it