First a little preamble. Go use tweekly.fm. Really. Scott (@ssxio) is a great guy and has put a lot of hard work into it.
so why lastweekly?
A while back Scott was considering retiring tweekly.fm. That would have been a sad day indeed. In preparation for that I wrote a thing to replace it and it sat on my laptop. This is that thing.
In 2010 I wrote toppr to post last.fm listening stats to a Movable Type based blog. No one does that anymore, but that spark of an idea stuck with me.