Supercharge your custom post type archives by letting visitors filter posts by their terms/categories. This plugin handles the whole thing for you!
SEO Tag Cloud Widget displays the tag cloud in a SEO-friendly way, using a search engine optimized html markup.
OZ Canonical is a plugin which helps you to edit the canonical attribute easily and fast on all of your blog's pages.
Inserts canonical link code into header. After activation, from your WordPress Settings, change Permalinks to Custom Structure: **/%postname%/