The site look clean and fresh. I looked at one of the videos. Great! All you need is some more video content. If you can add alot of these "how too`s" then you can start contacting folks to see if they can add a link to your site for free tutorials. What are you using to create these tutorials?
I like the site as well, very clean and business like.
I`d like to make a suggestion regarding future videos. Office 2007 is giving people fits over the new interface. Some people like it, some people hate, but it is new to everyone. If you had videos on how to adapt key functions in the new version I think that would be pretty popular. I love the size of the videos and how easy they are to see.
Targeting corporate help desks may be an interesting customer stream. I run a help desk and I struggle to find time to create end user documentation.
I would give thought to having the videos go through the "how to" process fairly quickly the first time and then repeat it a second time much slower.
Best of luck,