I'm the kind of person that likes watching numbers tick up, and I wanted to see my PP in decimal points after I play a map. So I wrote ppwatch, a small command line tool that tells you your PP count as you play maps.
It's simple to use - run it, fill in the prompts (it'll only ask you for your information once), and get your PP!
It doesn't flood the osu! servers, as it only requests updates when the title of the osu! window changes (which happens when you start/finish a map), meaning peppy should be happy!
This is still very much in beta, and if you have any features you think should be added, let me know here!