For the Pat Sullivan Blog regulars, you already know that we've had TERRIBLE problems with line breaks in the comments. Basically, it has resulted in long blocks of text, no matter how many times you hit the enter key. While TypePad Tech Support does not yet have a permanent solution in place, we do have a work-around for the time being: the <p> html tag.
Using the <p> html tag to force a line break is actually very easy to do. At the beginning of each new paragraph, you first type <p> and then type the rest of your paragraph. At the end of the paragraph, you "close" that paragraph by using </p>. When you preview your comments, you should see it create line breaks.
Bonus Tips: If you want to bold a word or phrase, put <b> at the begining and </b> at the end. If you want to italicize a word or phrase, put <i> at the begining and </i> at the end.
The secret is don't ever forget to "close" the tag. Hope this helps a little bit until we get the full problem figured out.