I know this is on the Blapp homepage - there's even a screenshot of it working - but I never tried it out until now.
Dang, that Links window is cool! It scans all blog entries for hrefs, then presents a simple interface to list and search them, so you can reuse previous links. Well done. Dragging an item from the Links window into a new blog entry even generates the appropriate HTML element. Slick.
Now, wouldn't that searchability be a nice addition to the Safari Bookmark Manager?