Do you mean when the post shows just a set number of words...then you see the (more...) link? You can use the Excerpt tag to show up to 120 words of the post, or as you're writing a post you can insert the 'More' tag to cut off at whatever point you prefer. This is under "Write Post/Quicktags". Using the excerpt feature requires you to adjust your template.
I saw this plugin from a blog that I usually visit. He uses a Gravatar Signup plugin that allows commenters to sign up for a gravatar by clicking a checkbox and filling in a desired password.
New and improved AdSense plugin for WordPress, see this thread .... http://forums.digitalpoint.com/showthread.php?p=254068