We recently purchased a Toshiba Netbook with the Verizon 3G Mobile Broadband card installed and we are using the internet/mail just fine.
We also purchased a WiFi enabled printer that we thought would print wirelessly from our netbook.
This does not work and we're wondering if we need a router or some other device???
I'm not totally sure how a wireless printer works, but I'm pretty sure you need a router. You'll connect to the router from your computer using WIFI. You can connect you printer using WIFI or USB cable. CradlePoint makes several really nice routers. I own two of them and got them here. http://moremobileinternet.com/