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From this point of view, EPUB is pretty good: they're a ZIP archive of HTML files. The subset of ZIP used in compliant EPUBs is a completely open standard (with complete open-source implementations).
So the worst case in 50 years time - you have to rename it to .ZIP, unzip it to a directory, and make sure your OS recognises the files as HTML (I guess some pathological cases might require you to rename them to add a .HTML extension).
Any PC EVAR will be able to read the resulting directory. I can even read it on my e-reader (OpenInkpot-based).
Just remember to strip any DRM *now* - there's no guarantee you'll be able to find the same DRM software in 5 years time (even the official reader software...). And remember to keep a PC. I'd be very surprised if you can do this unzipping and renaming on the current version of the iPad :-).
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