[Lizard]

-Omni - stuff that needs to be done when I'm physically at work (may or may not actually be work activities)
-Computer - at work or home computer
--Laptop - stuff that has to be on my personal computer, like uploading photos
--Groceries - yes, this is a computer context b/c of fresh.amazon.com
--Amazon - so I can batch orders to save on shipping
--Bugs - accessing our bug-tracking database from home is cumbersome, so I like to batch these
-Home - chores, looking up stuff in files, etc.
-Out the Door - anything that needs doing in that awkward transition between other contexts, like "take book from home to work". I can't act on it while I'm in either the Home or Omni context.
-Broadway - errands within walking distance
-U Village - another cluster of errands
-East Side - another errand cluster
-Downtown - another errand cluster
-Phone - calls that need to be made during business hours. Other calls tend to go in the Home context
-People (this has several sub-contexts for specific people or teams)
-Waiting - I hardly ever use this. It's mostly a relic of the default data
-Research - a dumping place for half-baked ideas. Maybe this shouldn't exist...
-Someday/Maybe - another dumping place, which may or may not be redundant with Research
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I think I'd have all these contexts even without an iPhone. When I am about to head out to U Village, for example, I'd like to be able to quickly retrieve all the errands for that neighborhood and maybe print them out or write them down.