Let's say you want to start a video blog, want to do it for free, have no hosting, and don't know how to code HTML.
Try out blip.tv (beta).
Right now you can go over there and sign up, upload a video and a thumbnail, and have a blog. It's very easy.
I just went over and started up a blog and posted my first video in a few minutes. Check it out at blip.tv (beta).
Note: Keep in mind that your thumbnail has to have a width of 320 to look nice.