I have too many hymnals. They're useful reference works for worship and portals into the lived theology of a community. But they're massive and costly.
Enter the iPad interface for the Hymnary.org scanned hymnals collection. Which is a misnomer; I use it on my desktop, though the idea is to keep a tablet computer at your keyboard and use the interface as a hymnal. A public domain, and thus old, hymnal to be sure. But I love how one can flip through different versions of the same hymn. Valuable, that.