No Problem, Tony is here!!!
Like everyone else with an IPhone, I was ready to throw it through a window as suddenly it stopped syncing my video after I had properly converted them.
I am presently running iTunes version 2.2.1
Why Apple made such a stupid change is beyond me, but here is the simple solution.
Once you have converted your files and placed them in the proper folders, simply
open iTunes - > GO TO FILES -> ADD FILES TO LIBRARY - > Click on the file you want to add.
Go to the video section in iTunes for your device and put a check mark beside the new video.
Now click on SYNC.
I hope this helps everyone. Oh yes, I have found this works for other files as well, such a when my music files do not update.