I searched and did not find any relevant threads on this issue, but I know others have had it. I just cannot find it. Well basically, my Early 2008 model of the MBP has very erotic trackpad issues. Sometimes it will not work all and I have to wait 5 or 10 seconds for it to see my finger (keyboard works though). Scrolling many times does not work and two fingers spaced apart still act like one. Many times, the three finger swipe doesn't work. This only occurs in OSX though. In Windows Vista it all seems fine (minus the three finger swipe since it is not supported). I also notice that tap does not work many times. It's a really random issue, but it keeps on getting more and more noticeable. I just sent my laptop in because the hard drive failed and they replaced the keyboard, which I believe is connected to the trackpad as well. Anyway, I don't believe it's a hardware issue, I think it's software. Today when I called, they instructed me to reset my SMC controller (and oddly enough, the guy called it the PMU which is the Powerbook or iBook equivalent.) I had to go because my class was starting, but tonight I called again and talked to a woman that instructed me to reinstall OSX. I started to but quickly canceled because I didn't have enough patience and I just installed OSX this past weekend. I'm lost at solutions. Nothing seems to help permanently. I have all the latest updates, and I want to say the problem got noticeably worse once I installed 10.5.5. I am going to write an email to Steve about my issue and point to this thread so maybe he will be motivated to look into the issue more. So please, if you have any suggestions or if you have this same issue, please post your problem.