In reference to jojobach from 11/04:
"...I think the word here is "serviced". I was having the same problem after I cleaned my trackpad. But in 2/3 days it was running smooth again.
Some days after these events, I took it for service in the Apple store because I had a non-working line in the screen. When it came from the store it started to have the same problem again and I took it there and presented the problem. The technician said it was normal because they had had to open all the computer and the trackpad needs some time do adapt again. And after 2/3 days, it was running smooth again...."
This was very helpful. I just put a 1 GB memory stick in my 1033 iBook, and suddenly the track pad didn't work. I had been so careful, following video and written instructions and could find no error. It was a relief to read jojobach's comment. It makes sense and I hope to have my trak pad operating again in a day or two. Will let everyone know what happens. ps I now have 1.5 GB memory in my speedy little ibook, ready for snow leopard!