I have done it the easy way. I currently have 2 wireless adapters
(one on each TiVo).

However, I have 2 or 3 laptops on the wireless network all the time,
some of them running what I assume are bandwidth intensive operations
(RDP, VNC, and FTP xfers to and from my place of work). I'd just like
to not have TiVos fighting for that bandwidth as I move programs from
the old TiVo to the new one whence I can burn them to DVDs. Moreover,
eventually I will probably set up another compute lab in my basement.
I would also like that lab on its own local hardwired ethernet, with a
wireless connection to the two floors above. So, knowing how to use
wireless as a "WAN" is good for me to know in general.

I don't know at what point wierelss slows down, but I could ensision
having a dozen devices that want to be on the net generally, and I'd
rather most of them be tied to a hardwired ethernet, so that I only
have a few wireless devices, plus the laptop in my hand and the one in
my wife's hand. In addition, I have 4 or 5 neighbors also with
wireless nets that I can see from my house. I'd rather cut down on
the interference with them also, better bandwidth for all involved.