Anki decks can be exported into the lowest-common-denominator format among SRS apps: tab-delimited text files. They're supported by pretty much every app worth using, and if they aren't, easy to transform them into something the app does understand.
From the discussions on the Mnemosyne-proj-user mailing list which I didn't pay any attention to, there are apparently a number of free SRS apps for the iPhone.
(What isn't usually all that portable is the markup for formatting, images, audio, etc. But I don't think any of these cards are likely to involve much of that.)
Anki decks can be exported into . . . tab-delimited text files.
If someone were to post a link to Divia's Guide to Words as tab-delimited text, I would look through it.
Followup to: Spaced Repetition Database for Mysterious Answers to Mysterious Questions
I've updated my Anki database for the Less Wrong Sequences to include cards from A Human's Guide to Words. I've been trying to put less information on each card, and I relied on cloze deletion more for the newer ones. Feedback is much appreciated. You can download them by opening up Anki, going to Download > Shared Deck and searching for Less Wrong Sequences.
I probably erred on the side of making way too many cards, but it seemed really important to me to internalize this stuff, since I think it has quite a lot of practical value. I can tell learning this deck has improved the quality of my thinking and my conversations with people because I'm better at noticing when I'm making one of the 37 mistakes and changing my course. I hope other people find it useful too!