I wanted to display a summary of recent items from a data feed in a block, using the titles as links to view the entire article. After evaluating different ways of grabbing feeds, I decided on the Aggregation module, because it offered most of the features I needed, with the least aggregation <g>. But it didn't have the block feature I wanted, so I built my own module to do so, called Aggregation Block.
It's pretty simple; there is an admin page that looks for any feeds you've added, and allows you to expose it as a block. You can add a custom title, and limit the number of items displayed. Nothing fancy, just does the job.
You can see it on my Electronovelty site, which I use it to pull in Drupal articles from Glatzland. Read more »