The subject matter has always been a mixture of dreadful puns mixed with allusions to movies I've enjoyed, references to other aspects of popular culture, cod-philosophical meanderings, and obscure jokes that I seriously doubt anyone else will get. You can see them all on this page, with the newest at the top. Just to confuse matters, June 2004 had two banners, one of which was used for a single day to celebrate the Blog's first birthday.
Click on each image to go to that month's archived blog. If your browser supports the feature, holding your mouse over the image should reveal alt text giving the month when that banner was used.