Video watermark factory - its a commercial grade product. A Business license cost $149.00. Personal license cost $49. I bought the personal license about 2 years ago and the program works pretty good. the home page is videowatermarkfactory.com You can use it to watermark with images, text, resize the video and watermark videos in bulk. If you wanted to watermark 100 videos, just add them to the import list and let it do its job.
oh yes, my bad, i confused visual hub and virtual dub. Here is how - http://forum.videohelp.com/topic248307.html