One of the great Electronic Library projects relaunched after it crashed from over use in the first hours last month...http://www.europeana.eu/portal/ combines many libraries from all over Europe. But there are already others: http://www.archive.org/index.php aka the Internet Archive holds collections including books, concerts(!) and other collections. Another project within the archive is the Open Library project at http://openlibrary.org/ which also includes a scan on demand service for book access. I think this is the true Geek Heaven...