Bit of a rant, sorry. I'm going to pick on Amazon, but others do this too: why does a Search timeout in a web browser?
Here is the scenario: do a Search on Amazon. See something interesting in the result list, click on it. Read the info, decide its not the right thing, hit Back to get back to the search list, then boom:
To resubmit your information and view this Web page, click the Refresh button.
WTF? It doesnt matter how quick you are, the search page has expired. Drives me crazy. Another Back takes you to the page that inputs your search. Grrr.