I am just thinking the same and I have been trying to find out if the solio solar chargers are any good (see link at bottom). I read a couple of consumer feedbacks and am now confused, some people say they are great, others say they it doesn't work well. They are expensive enough that while I am willing to pay for one if it works but not if it doesn't...
Otherwise there are emergency radios which also are supposed to be able to charge/run cell phone and most have a windup function some have an additional solar panel. Strangely NPR seems to have a selection of them:
http://shop.npr.org/catalog/Emergency_Safety-41-1.html?mode=families
There it's the same, I can't quite figure out how good they are.
I doubt there are any which produce enough current for a laptop though. You would have to check how many Ampere your laptop needs for running and what the output of a charging device is.