I just finished another project to wifi-enable DSLRs. Now we can wirelessly
control the shutter, exposure and camera setting. In addition, files can be
downloaded via Wifi. There are a lot of possibilities for applications.
Three components are required:
1) ARM9 board (US$89)
http://cgi.ebay.com/Samsung-S3C2440-ARM ... RM_W0QQite\
mZ120529622558QQcmdZViewItemQQptZBI_Electrical_Equipment_Tools?hash=item1c102016\
1e
2) wifi dongle (about US$10)
TP-Link TL-WN321G WiFi USB
http://www.amazon.com/TP-Link-TL-WN321G ... B000FO6QYU
3) A usb hub (a few US dollars)
I use the Gphoto2 library in Linux to control DSLRs. We recompiled source codes
so that it works in ARM-linux. Re-compilation is the complicated part of this
project. Almost any current and future DSLRs in the market which support the PTP
protocol can be wifi-enabled

upload it for anyone to use. The installation is simple.
This seems to be the cheapest and the most comprehensive wifi solution for DSLRs.
Best regards,
Anat