This plugin allows you to easily move comments between posts and pages, and it allows you to change comment threading.
This plugin adds a small form to every comment on your blog. The form is only added for admins and allows you to move comments to a different page and to fix comment threading.
This plugin is not designed for mass-moving of comments, rather for moving single comments from time to time. There are other plugins better suited for moving many comments at once.
The forms will be visible on every comment on your post/page, but not in the admin section. I found this more convenient than the existing solutions. There's also a widget included that allows you to turn the forms on and off in case you don't need them all the time.
Better tag cloud: I was pretty unhappy with the default WordPress tag cloud widget. This one is more powerful and offers a list HTML markup that is consistent with most other widgets.
Theme switch: I like to tweak my main theme that I use on a variety of blogs. If you have ever done this you know how annoying it can be to break things for visitors of your blog. This plugin allows you to use a different theme than the one used for your visitors when you are logged in.
Zero Conf Mail: Simple mail contact form, the way I like it. No ajax, no bloat. No configuration necessary, but possible.
Move WordPress comments: This plugin adds a small form to every comment on your blog. The form is only added for admins and allows you to move comments to a different post/page and to fix comment threading.
Delete Pending Comments: This is a plugin that lets you delete all pending comments at once. Useful for spam victims.
Snow and more: This one lets you see snowflakes, leaves, raindrops, balloons or custom images fall down or float upwards on your blog.
Fireworks: The name says it all, see fireworks on your blog!