I've found my Kindle 3 very nice to read in the sun. I assume any eInk reader with a nice Pearl screen is as comfortable.
Originally Posted by Namekuseijin
you enjoy sweating while you read?
Some people live in countries where bright sunlight doesn't equal blistering heat. I don't see what "sweating" has to do with me sitting on my balcony, enjoying the fresh air, and reading - in bright sunlight - when it's 12-14°C.