I've updated the my sky section of my main site to include a couple of daylight graphs. The first one graphs the rise and set positions of the Sun for the current day:
The second graphs sunrise/sunset times and total hours daylight for my location:
And the reason I added them? Well, no good reason really. They are sort of useful for a quick glance but the main reason I added them is because I fancied a quick bit of hacking (and also because I've been playing with compass-a-like graphs on my weather station site).