For those of you setting up your first blog, you may have found the option for adding an RSS or ATOM feed. These are structured streams of data based on the posts on your weblog, but stripped of the formatting information, which makes them easy to access via mac mail, or a similar news reader (like Google Reader).
These streams are also easily operated on mathematically, to create new streams. Yahoo pipes is a bizarre and unique website to do just that. Basically, you specify a number of streams of information, and use different modules (similar to a module based synthesizer for music) to chop, filter, or recombine the streams into one large RSS. Then, you can publish that feed, as I have done with the most recent post from each of the DS student blogs, on the right of the page (if you don't see your site, I'm missing your RSS feed, so see me in class.)
Play around with the tool. It's not just for aggregating stuff -- imagine setting up hundreds on Craigslist RSS feeds that all searched for the electric guitar you wanted to buy...
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