Imagine taking a shot with your DSLR (or any SD capable camera for that matter) and being able to share it straight on any device with a wifi connection. It's a feature available to several cameras that recently came out, but it's also something you old camera can do if it had one of these:
As far as my google searches have turned up, it seems that only the Trancend Wi-Fi cards and slower older versions of the ez Sh@re are available locally. I'll have to look around a little while longer. Additionally, I'm not immediately sold on it yet. I can't exactly use it on my Oly E 410, seeing as it's neither an XD or a CF card. However, I might be convinced to change my opinion if I get to try it out with a CFII adapter.