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Try out Publish Online – you can include interactions (and more), you can easily produce it from your existing InDesign document, it can be viewed on any device with a browser that renders HTML5 and you can set it so that the user can download a PDF version. The disadvantages are that it doesn't reflow to suit the device, it's hosted on Adobe's servers, you can't password protect or monetise the documents.
There are excellent online video tutorial for producing all kinds of digital formats on Puralsite.com and Lynda.com (you can get a free 30-day trial on these).
Thank you Derek. Lynda.com sprang to mind - but not heard of Puralsite. Will check out.