If you’re an InDesign user, you may have heard that version 5.5′s main changes were for publishing to the iPad. So you may be interested in Terry White’s latest Adobe Creative Suite podcast Lightroom to InDesign to iPad: Interactive Portfolios where he shows you how to take HTML exported from Lightroom’s Web and use it in an InDesign document which you then publish to the iPad. You can use any HTML gallery exported from Lightroom.
It’s pretty well the same route that I took when I wrote here about an app I’d been creating (the screenshots show some HTML animations which had been used in InDesign) and in other experiments or presentations since then. It’s perfectly doable, if you’ve got all the software, some InDesign skills and the time to figure it all out.