As a web developer, my life is the Internet. The older I get the more reliant I am on it, not just for work but for general information; look up something on google or wikipedia, get mail, communicate with skype, yellow pages, google earth, read the news, the list goes on. One problem I have had for a long time is access to the internet when I'm not at home or in the office.
For a while I had a Vodafone VMC card (pcmcia) which was OK, but slow and expensive. I few years ago I joined the Three mobile network (24 month contract - ouch) and their marketing propaganada assured me I could use the clumsy Motorola E1000 to do the job. Sadly the moto missed the mark by 200 miles.
But now some time has passed and technology has improved. I have resigned with Three and now have a Nokia N95 on an "X-series" plan (mobile data). The new MacBook Pro connects to the phone via bluetooth and the speeds are really pretty good, thanks to the new fangled HSDPA :-) I had a wee issue getting the right modem driver, but all is good now.
The downsides of the N95 are: cr@p battery life (compared to my old sonyericsson GSM phone), it is the size of a small family home and the UI is a bit garish and clunky. The upsides are: it does EVERYTHING.