Hi,
I use the router approach to add wireless capability to devices. I have an Asus RT N16 router moded with Tomato firmware. This approach offers wireless capability to any network device. Of course you need two wireless routers to accomplish this. Gives the Obi unit instant wireless capability. In addition to connecting the Obi unit some Asus router models have USB ports. This gives wireless capability to USB printers and web cams. If someone wants to go this route, Asus routers are nearly impossible to brick. If you are new at this sort of thing, this is the router to use. The popular linksys WRT routers seem to be more prone to bricking.
For those considering voip security using the Obi, the Tomato firmware offers VPN connectivity with an easy to use GUI interface (OpenVPN). Lots of other neat tricks can be accomplished using these custom router firmwares (Tomato/DDWRT). They are very easy to install on the Asus routers. At the moment the RT N16 model seems to be the hackers device of choice, because of its specs. Heck you can even install asterisk on the router. Makes for an interesting project.