Came across this paper recently:
Liu, C., Shi, L., Xu, X., Li, H., Xing, H., Liang, D., Jiang, K., et al. (2012). DNA Barcode Goes Two-Dimensions: DNA QR Code Web Server. (R. DeSalle, Ed.)PLoS ONE, 7(5), e35146. doi:10.1371/journal.pone.0035146
Despite QR Codes being uncool, there's something appealing about the idea of compressing a DNA barcode sequence into a small image. Imagine having a specimen label with a QR Code, pointing a smart phone at the label using an app that converts the QR Code to a sequence, sends it to BLAST and returns a phylogeny that includes DNA from that specimen (perhaps using a service like http://iphylo.org/~rpage/phyloinformatics/blast).