I’m surprised that it didn’t happen sooner, but the hidden message in the Nagios/NSA t-shirt. was successfully decoded at the NETWAYS Nagios Konferenz yesterday.
Gerd Mueller from NETWAYS saw Sandro Vaz from OpServices with the t-shirt, snapped a photo of the barcode on his mobile phone, and decoded the image. I won’t disclose the hidden message here, so you can try and figure it out for yourself. Congrats to Gerd for his quick thinking and fast work!