I have been using DVdate for some time now to simply looka t the timecode on my DV-AVI files, which is freeware. I also used it to rename my DV-AVI files to have the timecode in the name.
Recently, I went to the DVdate web site an noticed they had an upgrade - to 7.0. An interesting new feature is that it can correctt framerate problems:
From the web site: "fix the framerate of an avi file : it may fix some out of sync issues, specially when an analog capture board did not set the correct framerate"
I do not have audio sync problems, but I know there are folks who do. Maybe they should check out DVdate to see if this fixes their problems.
Here's the link:
http://paul.glagla.free.fr/dvdate_en.htm