[Stargazer]

I approach contexts by asking myself at various points during the day, "What kind of list of tasks do I wish I could pull up right now?" and the answers to that question are candidates for possible contexts. So for example, like you, I always have a computer and phone with me, and therefore never find myself thinking, "I wish I had a list of things I could do on the computer right now." Instead (and this is completely personal to me), I find myself thinking things like, "I have a block of time to work on a big project, I wish I had a list to choose from" or "I only have a couple of minutes, what can I do?" and so on. So I have contexts for large projects and small items. And so on.