I've jumped on the WiFi waggon a few months ago and I would suggest avoiding 
Linksys.

I've got the Linksys WPC11 ver.3 PCMCIA card and befw11s4 ver.3 AP.  The 
PCMCIA card stops communicating with the AP for no reason and after an 
indeterminate time.  I have to restart the wlan service or remove and 
reinsert the card to get it to work again.

I did a search on Google for a solution but all I could find is a bunch of 
other people having the same problem but no solution.  From what I can tell 
from the posts, Linksys' own WPC11 ver.3 PCMCIA card won't work reliably 
with their own APs.  The card looks to work fine with other manufacturers 
APs though.  You would think a manufacturer would do a little quality 
control especially with their own products but it doesn't look like it.

I used to be a fan of Linksys because their cards are cheap (low cost wise) 
but with the problems I've had with the WPC11 PCMCIA and LNE100TX cards I 
now just think their products are plain cheap.

That's my 0.02¢.