I'm not sure why folks seem to be struggling with this.
Using iTunes 11, open iTunes, select the movies tab at the top of iTunes.
Using Windows explorer, navigate to the file folder where the movie file is located. Select the file and drag and drop it in to the iTunes window where your current movie files are showing. Keep in mind that this will only work with movie files that iTunes will play natively (MPEG, MPEG4, QuickTime, etc.). It will not work natively with .avi, .flv, .vob, .rm, wmv. If you have these types of files you will need to convert them to a native format before you can drag and drop them or import them as Europa noted above.
Connect your device.
In iTunes, scroll to and select the movie file you just copied. Please bear in mind that the new iTunes will separate purchased content and home movies (such as recorded by your phone or iPad). These will be on a separate tab labelled Home Videos.
Once selected, drag and drop the file on top of your connected device in iTunes and you will see a copying dialog box show in the top display window in iTunes. Once copied it will appear in the movie list on your device.
I thought the whole purpose of 11 was to clean up the screen and remove the sidebar.
Maybe you can help with this one too
With my videos....
They are grayed out when "sync" is unchecked for the iPhone. As far as I remember if you checked that you pick and choose which ones you want to go in the iPhone; well when I do that and select lets say 3 or 4 it wants to put every single one on.
In other words it all by checking the sync box but if I don't check the sync box I can't do any.