Breaking down the @computer context by device doesn't sound artificial to me. IMHO it's exactly what DA meant when he suggested @computer in an era when dial-up modems where the most used way to access the internet. Also, if you need a specific device to do a certain task, that's exactly what a context is.
However, if the real context is @computer (and not @ipod etc) then it is just that and breaking it further is just breaking it, sorry, but a context is a reality in your life, if it is.
So, if you find yourself to be without help against a very long @computer list and sub-dividing it doesn't help any, then why not use the rest of the plain vanilla GTD system to the rescue?
Following the rules for processing and organizing strictly, you will end up with a @computer list, which you could just work off one task after another. Regardless of length, just do the first @computer task and then the next and so on. Yes, but..
I understand. I am in the same boat as you, trying to make GTD work for me, because DA's kool-aid with the mind like water tastes so good. So, how do we deal with all those "Yes, buts"?
Mhm, let's take a look at them...
Over here, we have 5 @computer "Yes, buts" that need to be dealt with this week or actually better yet today and tomorrow.
Okay, take a look at the calendar, do we have enough time for that?
Nope, I am overcommitted, but I am willing to choose rage from wife over rage from boss and work longer hours tonight and tomorrow night.
Allright then, what about scheduling those 5 for tonight then?
I can't schdule my whole @computer list!!
I know, I know, just those 5, okay?
What other "Yes, buts" do we have on the @computer list? What about those 10 projects over there you wanted to get "creative" with? What about them? Maybe we can decide on 1-4 for starters instead? Or we make them all one project and work them one at a time? BTW, are you happy with your Someday / Maybe regime or is it just the @computer list?
What else? These 2 tasks over there, your are nervous about them, why?
I want to do them soon!
Why didn't you do them then?
Ah, it's complicated, it's better to do them when Elaine is away from here in a meeting while at the same time I have the time AND energy...
Put them in the Tickler file and re-tickle them everyday until you had the opportunity to accomplish them.
What's a Tickler file?
What's a @computer list that is too long?
It's a pile of halfway processed inbox items.
But I am a geek by passion and profession.
Me too, however, we too have only approximately 24 hours a day.
Beware the subtleties of the Tickler.