The second category is more common, since people usually purchase or rent ADSL modems from their service provider and then want to connect them to their own wireless network. The first category can be convenient if you're starting from scratch, since you'll have just one device to buy and configure. But it's essential that your purchase an ADSL modem that's compatible with your ADSL service and can be provisioned by your service provider. I suggest contacting your ADSL service provider first to see which wireless ADSL routers they support (or can sell you with your ADSL service). To pair with the Centrino adapter in your laptop, you'll need 802.11b wireless in the router. Note that an 802.11g router can support 802.11b, but your Centrino laptop is only going to make use of 802.11b features right now.