Videos are a great way to enhance your blog posts. We use videos all the time on the WordPress.com News blog and in our Support documentation. So can you.
You can embed videos from many video services on your WordPress.com blog for free. Upload your video to any of these services and then embed it on your site by following these instructions: YouTube, Vimeo, Hulu, Flickr, Animoto, DailyMotion, Viddler, Blip.tv, TED Talks, Educreations, Instagram, AolOn, Vine, and Videolog.
If you want to upload and host your video files on your blog, you can do that with VideoPress, which is included with the WordPress.com Premium and WordPress.com Business plans.
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