On my sidebar, I have added a tags area with a list of the tags I intend to use. I will add more tags as needed, but I intend to keep the list relatively short.So I'm guessing the tags are added in the post template as html blocks?
Each of the tags in the list is linked to a Google Blog search referencing the relevant tag. Because my blog is hosted by Blogger (Google) it is indexed almost immediately when I post. So, clicking on the search link brings up a results page, ordered by date, referencing all of the articles on my blog with those tags. And, since I have just started tagging my entries it also has the advantage of searching older articles for key words in the body of the posts in addition to the tags.
To make posting easier, I have added all of my tags as part of my default formatting template from the Blogger settings. Then, each time I post I just delete the tags I don't need.