Of course there are lots of options for more modern symbology as well, and this writer’s personal favorite is the “Spinner” from Panic Goods. At $20 it can seem like a bargain compared to some to the other stuff out there; the softness of the cotton and the fit of the t-shirt itself make this gear second to none in my book.
For those of you who actually do the work, you might also consider Panic’s “hi, i make macintosh software” design, shown below.
Another popular modern symbol with a number of designers taking a whack at it is the Spinning Beach Ball of Death. If that’s something you want to go out in the world wearing, then consider the iteration concocted by Subverted, also available through Cafepress. We like this one because it seems to do a pretty good job of capturing the “motion” of the spinning beach ball, something some other designers seem to come up short on…