I am not as interested as I once was in some topics. How can I remove them from my interesting tag list? Adding them to ignored tags may work, but I want less clutter, don't want my tag lists to grow indefinately
You don't need to go anywhere -- just click the little [x] next to the tag on the sidebar.
Click on your username and go to the tab "prefs". There you will see small crosses next to the tags to delete them.