Commen Highlighter is a plugin which can be used to add different style classes to comments. There are already plugins/hacks/alterations that adds a style to all comments written by the blog owner, adds a different style to every other comment, etc. This plugin takes it a bit further.
Feed Footer allows you to add footers under all your blog posts in your RSS feed.
Gossamer Threads Tag Cloud allows you to create tags for your posts and display them in a cloud on the sidebar. Tags with more hits are displayed in a bigger font to express popularity or emphasis. Tags can also be displayed underneath the post entry.
ipeRSS allows you to add your images from ipernity directly to your Blog (as a site, in an article, in th esidebar, etc.). If you want to add the images as a site or in an article you need something similar to Exec-PHP or runPHP.