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I'd go with an awning. If you want to get fancy, make a permanent one with wooden slats that only shade at the right angle of sun. Plus, can you have windows on both (or even 3) sides to maximise airflow?
Shed heat problems aren't just from the window IME, more the small overall space and heat through the roof - you want to get any breeze available flowing through from any direction.
Sun is one of the things that's concerning me with my build* - It will be West facing, and likeley to become unbearable from early afternoon, if my neighbours' experiences are anything to go by.
One neighbour's office, which isn't has less glass than I'm planning, has already suggested that aircon is a must.
I'm considering a few options:
Top runners at the moment are 1. and 3. - I can always add 2. later.
Air conditioning is out for a number of reasons - there's not enough space behind / beside the building to have a separate split unit, nor even to have a through-the-wall unit. I probably don't have hefty enough of a cable installed to support the power requirement of an aircon unit either.
*Actually, during the build, it's the constant rain that's concerning me...