Also on Apple
Not to split hairs, but would seem to be pretty important - I have used Zinio on my MacBook Pro for over a year for several different magazines and even a couple of books. Also looking forward to seeing the iPhone app when it comes out - may be good, may be terrible; we'll see.
I am also in the U.S., so I don't know if it is different in the U.K.
One thing I like about reading magazines digitally (though my favorites, Entrepreneur and Fast Company are not <yet> offered) is that if I have thoughts, need to do more research, or communicate with others about what I'm reading, I can take care of all that in one place. Otherwise, I have to make separate notes in either my notepad or word processor and take care of it later. So, the efficiency that digital provides is nice.