To avoid comment spam, my blog comments are displayed as plain text. However urls to other entries on my blog are often posted to in the comments. So I wrote a simple regular expression to create hyperlinks out of them:
REReplaceNoCase(comments.comment, "(http://www\.petefreitag\.com/[^[:space:]]+)", "<a href=""\1"">\1</a>", "ALL")
If you want this to work with or without the www you can use something like this for the regular expression:
(http://w*\.?petefreitag\.com/[^[:space:]]+)