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Lonely Planet volcano relief - free European iPhone city guides!
The lineup of apps covers most major European cities, and a list of the cities included (with App store links) can be found on the Lonely Planet blog.
Of course, nothing is stopping you from downloading the apps if you are not stranded, but be nice to Lonely Planet and snag one of their paid apps as well - they are good people, and the quality of these free guides is quite impressive.
This isn't even the only bit of goodwill from Lonely Planet - they have also opened up a discussion forum where stranded travelers can find some assistance. To find a bed, car for share or anything else - head on over to the Volcano Refugee Network.