I wrote about the different aspects of blogs (links, sound, pictures and words) here and here.
Also, go here for a really good reflective blog about blogging.
Links are very interesting and they can subvert a blog as you link the meaning to something completely different.
Images are next - I am not so good as people like Dr Joolz who use Flickr as much as blogger for their on-line identity work.
Sometimes Flickr is more important - like with Litrate's blog.
Words can often be shared - I often write about something someone is following on another blog.
Memes are games you play across blogs, see here for more about them.
Blogging is exciting, time consuming but it changes all the time.