I'm selling t-shirts with some of the more interesting designs. Proceeds help support the time-consuming process of transfering programs from tape to disk, importing them into the emulator, running them while recording a movie, converting the movies to an online-friendly format, and uploading them to the Internet.
T-shirts with images from each PET program are available on the pages that contain the videos for each program.
Can't find a t-shirt that you want? E-mail me and I'll see what I can do.