I added “related post” functions to this blog today. Basically it will show “related posts” at the end of each article if you go to each post (by clicking on the title). Hopefully this will make navigation of this blog a bit easier. Now we have search on the side bar (search by word, search by Google), and this related post thing. I also added “save to del.icio.us” button at the bottom of each post.
I also added a language (translation) tool at the right side bar. You can click on the flag to get an instant translation of this blog. This is based on WordPress Global Translator Plugin.