I would recommend the centrino laptop as well.
They have the wireless card built in and use less power than a add in card. This means longer battery life when using the wirless network.
Now the AP you mentioned is an access point and would connect to an existing (wired) network to provide the wirless access.
Keep in mind when you are on the road you will have to find a free or pay for service public access point.
If you want to access the internet from anyplace your cell phone works a service like Verizon mobile office works good. It is a different card and technology than the Centrino and wireless network things discussed above.
It can be confusing but if you get wireless capability in a laptop you still have to connect to an access point someplace to get on the internet. I think most starbucks have access points setup as do many hotels. Most are fee for access setups like
ipass,
boingo, or t-mobile services.
Let me know if any of this is unclear.