Video Editting Software

We were going to visit the National Media Museum, but due to son #2 getting a stomach bug on Saturday night that wasn't to be. Instead we made a video diary of the weekend. My camera records quicktime (.mov) files. I had about twenty of these to splice together by the end of the weekend. I didn't have a video editing program to use. A little wikipedia led me to avidemux. This seemed lightweight and just right for what I needed. To get a rough cut done to show the wife I just appended the files together. This worked fine, but after about three minutes the sound was a long way out of sync with the video. A quick scan of the avidemux wiki suggested I do Audio->Build VBR Time Map. I tried that but it didn't seem to do anything. Clicking somewhat at random, I don't know much about video, I tired Tools->Rebuild I & B Frames. That didn't help. I'm parking this one for now. See if inspiration strikes while doing the tidying up.