Blogger has two new features (if you haven't know). The first one is enclosure links. It has been added in the Creation page (where you can write your posts). I don't know what's the use of this features, but i guess it's for linking to something which is not HTML/XHTML type. You can add a link to other MIME types as well. There's no information about this feature on Blogger's help also (for now).
The second one is inline ads in the layout/template section. Now you add inline ads (from Google AdSense) on every post you made. Just choose template, and when you see the layout, you will find a new link in the Blog Post area. Click that link and you will see a new window which can be used to set up the ads that will be displayed to your blog.
There are one more thing, but i guess you already find out about this. Blogger now able to upload a video, not just images. It has been available for some time, so i guess you have figured it out (or probably have been using it to bring more interactivity into your blog).