There's been a lot of buzz in the language-learning blogosphere about SRS lately. See Mastering Mandarin parts 1, 2, and 3, Ramses on Free Technology for Teachers, Tower of Confusion, Flashcard Aficionado, and The Linguist on Language.
After the jump, a few highlights.
For the uninitiated, here's a brief definition, courtesy of Wikipedia:
Spaced repetition is a learning technique in which increasing intervals of time are used between subsequent reviews, rather than studied frequently for a short time...Although from last year, it's worth pointing out that All Japanese All the Time has a pretty in-depth series on how to make the best use of SRS.
The consensus appears to be that the big players in SRS software are SuperMemo, Mnemosyne, and Anki. Mastering Mandarin has a brief overview of these, Cunning Linguist has a slightly longer one, and Nihongo Pera Pera has one that's much more detailed. I'd fault them all for leaving out Smart.fm, f.k.a. iKnow.co.jp.
Everyone seems to love their SRS, but Steve Kaufman goes against the grain, arguing that SRS might not be the most efficient way to learn, at least in part because it lacks "resonance".
If you're interested in implementing an SRS system in a classroom, Ramses of Spanish Only has some useful ideas for you.