Well, there are PCMICA cards and there are PCMCIA cards. I have had nothing but headaches from Linksys PCMCIA cards, have had good luck with Netgear and D-link, and am currently using a Hawking, if you are going to get one, I suggest Hawking. The one with the adjustable antenna.
Now, with USB adapters.. Again there are good ones and not so good ones, I tried a hawking, a small one, and basically did not like it... Hawking also makes one that looks like a mini-sattalite antenna... Now that one is quilte likely the second best on the market... Hawking also makes the best