1) An external card provides a greater degree of flexibility vs an internal card
2) Differences in speed are virtually non-existant between USB2.0 and PC card types
3) The ''A'' standard is virtually unused. ''G'' or universally accepted and backward compatible to ''B''.
Note that Pre-N and other MIMO technologies are the up and comers.
4) Speedbooster can help in LAN transfers, but does little for Internet speed.
I have a Dell Inspiron 9100. I didn't get wireless when I bought it and regret it but I want it now. I went to dell.com and bought an internal card and it dind't work and was a pain. I returned it and now back to square 1. I travel quite a bit so I need this card to be flexible and have good range.
1. Should I go to an external card?
2. What is the advantage of a USB vs. card?
3. Should I make sure I get one that supports a/b/g because I travel?
4. What about speed? Are the ads overrated when it tell you that it has a sppedbooster, etc...?
Thanks!

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic