I haven't had a lot of free cycles lately, but I wanted to get deeper into Chatter. For me, getting deeper into anything (ok, almost anything) means code, so I wrote Chatter Tags (check it out on the Chatter Dev Zone). Chatter Tags displays posts associated with hash (#) tags, at (@) tags and predefined keywords regardless of who wrote the post. You can read the gory details about my experience developing with Chatter on Apex Dev Net and you can explore the resulting code as well.
Summary: it's not hard, and you can see results quickly. Read it now and post comments to me in the CDZ.