A very useful wordpress plugin: WordPress Paged Comments Plugin
It’s a good way to keep your comments tidy when you have a tremendous long list of comments. Check it out there and click Show All at the comment section. You will know what I mean. I have seen a lot of blogs, and there are a lot of comments, while I open those pages made my brower Slow! Now, you can use this WordPress Paged Comments Plugin. But my site just have little comments, so you can not see the power of this plugin. lol!
WordPress Paged Comments is a plugin for WordPress 1.5 and 2.x to allow comment paging. Useful for those popular blog entries receiving many comments, or a simple guestbook page within WordPress.
You can download it here