Yes. For the foreseeable future, there will be free screenshots for everybody. You may have to wait in the queue when there's a lot of demand, or you can buy priority processing.
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Yes, even for inclusion in closed, for-cost works. It would be nice if you'd mention that you used browsershots.org for the screenshots, but you don't have to.
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Activate Your Link
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Invoices
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If you have any idea for improvement, please <a href="/contact">let us know.</a>
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Most of these are normal desktop machines with domestic broadband internet. Distributed community processing ensures O/S and browser diversity, but it makes quality assurance much harder.