If I'm away from the office or my house I always carry my Sony Vaio T2XP ultraportable with Vodafone 3G Broadband card. Before I had the 3G card I used to connect via Bluetooth to my mobile, and before I had the T2XP I used to carry a HP iPAQ H5550 and do the same thing. It has probably been about 3 years since I had a 100% Internet-free day, and even then I probably hated every minute of it
I've had quite a few, when I came to uni it took me 4 days to get online. Encryption and a lot of hoops to jump through. It bothered me slightly. But not much.