
You can use
post tags for a while now to mark relevant tags and keywords related to your posts. Once you start assigning tags, they pile up a categorization structure for your blog; which in time helps eventual visitors classify your blog in an instant. These tags are also present in your RSS feed; which means increased chances to be found using keyword searches. We launched a new blog feature called
tags cloud; here is the detailed
wikipedia explanation. The more tags you assign to your posts, the more proeminent this tag will be in your blog tags cloud.
If you use a customized blog menu template, in order to enable this feature you should add this code to your template:
<li id="links">
<!-- Tag cloud -->
</li>
An example can be found
here. This is enabled by default, but (as always) you can remove it anytime from your
blog menu template.