Recently, I have seen a new trend emerging on the web. Until quite recently, we had people publishing their information as RSS feeds and others subscribing to it. This was the first step towards the pub-sub (publish subscribe) model.
Then came tagging and people started publishing 'relevant' tags along with the feed entries. This has helped in the emergence of a new trend, wherein I am able to track not just websites, but information pertinent to certain keywords (or tags).
A major advantage of this is that I don't have to subscribe to RSS feeds, rather I just subscribe to a set of keywords (optionally combined using a regular expression) and then get information based on it. I have been trying this for quite sometime now and have been getting wonderful results.
In fact, this is how founders of websites are able to track the popularity of their tool by just subscribing to the keyword that relates to their website. The moment someone tags their blog entry with this tag, it arrives in the feed readers of the founders and they are quick to comment and 'show interest'. Here's more information and an example of how the founder of a website tracked my blog entry within a single day and here's another.
Hoping that tagging is not misused (remember what happened to <meta>?), we have a new way of tracking relevant information.