You stole my thunder LOL. That is exactly what I do for myself and now for clients :). And I started doing it for the exact same reasons you state above. Wasn't too thrilled with the idea of making a video of myself.
Another option to recording your voice is to use a musical background that is catchy and let the viewers read the text as it bounces and flies in. You will want to keep the text per slide as short as possible to make is easy to read. If you do use music, be careful to NOT use music that is copyrighted. Go for music in the creative commons category but be sure to check the conditions before using the music. Same for images. Be sure you have the rights to use an image before using one. I have heard of a case (not me thank goodness) where someone was fined a lot of $$ for using an image that he didn't have the copyright to.
You can check out my video on my profile and Doug Rector's, another Biznik member (http://biznik.com/members/douglas-rector) who has one of these videos on his profile.
BTW - it is not quite as easy as it sounds. It does take time to create a compelling and attractive video with images that are representative of the content. I like to use humor in my videos but it is a matter of personal preference and specific industry. Witty just doesn't work in some industries!
If anyone would like help creating a video - you know where to find me :)