It is misleading that the HN title suggests the author is Martin Fowler, but this is not the case for this guest article. The actual author is Mike Roberts, the article is hosted on Fowler's site.
Here's is my slight change to the bookmarklet code. It's not fool proof and and I'll have to see if it actually results in me editing submitted story headlines less often or not. It basically takes the substring of the document title from the start until it finds the first hypen (-) or pipe (|) which are what seems like most sites use when appending the site name.
