Great article Ellen. Thanks very much. Has me thining for sure.
I'm in a coffee house maybe one day a week for two - three hours. It's my local spot, and I always make sure I drink, eat, refill, and tip. I'll be more aware thanks to you, in case I see no open tables.
There are also some awesome coffee houses around that are specifically for work. Bardo Coffee House near Denver is like this, and they give you two hours online per purchase. They are also setup for work with lots of table options and mostly two-tops.