I saw a similar tee elsewhere, but I like that in this case the proceeds go to OpenSSL.

Also, the fact that a t-shirt can be made out of this supports Patrick McKenzie's article [1] yesterday, commenting on how this bug (or rather, its announcement) has been a case of successful marketing.

[1] http://www.kalzumeus.com/2014/04/09/what-heartbleed-can-teac...