Well.. It can be tricky to actually know what you are getting especially when the sales person is not correctly informed..

Wireless Ready, Wireless capable, etc. usually means you need an addition gizmo.

An additional device is not all bad. I have not seen a true wireless blu-ray player that can support the 5ghz N. All are 2.4ghz, even though N capable. The 2.4ghz spectrum is over crowded and makes reliable & fast wireless connections painful at best.

I actually use a wireless router with 3rd party firmware that allows the router to run as a client bridge. I then have my TV, blu-ray player, and game console connects to the router via cat5e cable.

A descent router with a 5ghz radio capable of running alternate firmware to serve this purpose costs less than the OEM wireless adapter.