Looks like we're the fools here. The Personal Soundtrack T-Shirt was originally an April Fool's Prank... but due to overwhelming positive response and hundreds of e-mails screaming to "make the damn shirt already" we're putting this item in to production ASAP. Keep in mind our army of robotic factory monkeys are a bit slow, and it might take them some time to make the real version of this nifty product. Also although we'll try to keep the Personal Soundtrack T-Shirt as close as possible to what you see here, the final version might deviate slightly in appearance, features or price. Capiche?
No word as to when it will be available, but you can sign up for an email notification. Link -via Geek Like Me
(Disclaimer: I *am* a female consumer at ThinkGeek, if only occasionally. If you've ever seen the fit of their 'ladies' shirts, you'll know they don't do much for that demographic.)
You're right, that's how the 8-bit tie came about. those things are awesome.