Tumblr is one of the original microblogging webapps on the web. Many people hold Tumbleblogs of aggregated text, quotes, photos, links, video, audio and chat from all over the web. You can add your own comments to these items, or create your own text (blog entry)
A tumbleblog is very easy to use with bookmarklets in your browser to help you add content to your blog quickly.
Soup.io is another tumbleblog application, allowing for the aggregation of content from all over the web. Amalgamate video, text, audio, quotes, images, links, files etc onto the one Soup blog. Allows for use of your own domain name also.
Noovo has just come out of private beta. It works as a lifestreaming blogging aggregator. Add bookmarks, video, audio, text, quotes, clips, images - everything. Also use the Noovo technology to get recommendations for more content on your interest topic.
More features than Tumblr, however slightly harder to use.