Avi writes to let us know about his inline comment form, which requires an externally hosted script, some code in your template head, and a modification to the post footer to replace the "post a comment" link. Avi's post documents a number of variables that you can add to the script in the head of your template to customise the look & feel of the form for your blog.
This is a great hack, including bold, italic, link and blockquote buttons, as well as multiple comment signing options. If you're looking for an inline comment form, check out Avi's version. You can see alternate versions, which each have something to recommend them, listed in the wiki.
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