Wasn't sure what to expect when I saw the listing, but given that my day job is RIA and workflow (and some SEO) for an online printer, any talk on printing technologies is likely to be too tasty to pass up. And Enthusem's presentation was worth the time. Admittedly, I was aware of their offering from earlier research in small quantity variable data printing - in this case, a custom print piece in a greeting-card form factor stuffed into a transparent envelop and sent via postal service. Sort of a micro-VDP direct mailer. What Enthusem is doing right is focusing on a core business offering while exposing an API to developrs.
Smartly, they brought along a partner/customer who has created a custom iPhone application to leverage that API and allow purchasing custom cards featuring photos taken by the iPhone. A very cool app that I will likely never use (I'm anxiously awaiting the release of the Motorola Sholes Android 2.0 phone on Verizon - and hoping that it won't be a lemon)