...This way, readers are more likely to see what they want and so stay on your site....From the Fresh Tags Main Page
I am using a new method for categories that I found called FreshTags v. 0.5 - Freshblog. It uses, del.icio.us, but it is not completely necessary for you to have an account.
One the features that I like the most is tag-grabbing. It scans your viewer's previous page for keywords that match your tags, or categories. For instance, if you do a search for "Blog U CSS/HTML" then click on the link, my blog will reflect this by making the 'CSS/HTML' category bold and displaying a list of all my posts related to that category. Pretty awesome! I'm still learning about what all FreshTags is capable of.
The FreshTags site has more detailed information. When you visit, play around in the 'Build' area to make your tags the way you like for your blog. It is simple to implement on your blog. There are three sections of code that your paste into your template, then you are done! Set back and watch the magic!