We usually see some nice posts, on the xsl-list.
David Carlisle recently posted a very elegant XSLT solution to a question asked on xsl-list. It's archived here, http://www.biglist.com/lists/lists.mulberrytech.com/xsl-list/archives/200807/msg00574.html.
I really liked the following expression, in David's solution:
I might have solved this problem differently, but not as elegantly like this. Nice thought, David!