We've just rolled out a fairly minor update that fixes some bugs and also improves tags functionality.
For tags, we've added a new Tags list page that displays all tags on the site. Previously this list was only available via the Tags widget. We also now support filtering tags by content type (both on this new page and via the Tags widget).
Thus, you can view all tags in general or just all tags for a specific content type (like blog posts). You can also sort the tag list by total content count or alphabetically.