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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There were already %(count)d screenshot requests for %(domain)s today.
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Total %(count)s browsers are available on %(platform)s at the moment.
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Failed to update preset.
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Also, if your requested configuration is too specific (e.g. specific Flash or Java version) there may not be matching screenshot factories all the time. Try the <em>Don't care</em> setting for quicker results.
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The page is not finished loading.
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<a href="%(url)s">Reload this page</a> or bookmark it and come back later.