I've been using Mnemosyne for about a week now. I don't have much interesting to remember at the moment, so I've been working on memorizing the Periodic Table (both numbers-symbols and order, so I can write out the whole thing to impress cute nerds). I feel compelled to post because I just had a really odd experience where something was in memory that I didn't expect to be there- I had already memorized the symbol-number pair (both ways) for H-Ar (1-18) and just added the relationships (H->_? He. _->He? H). For a number of them, I blanked until I said "ok, Si is 14 and 15 is P, so Si->P." What was odd was that it worked- for some reason I was surprised that I was able to recall that 15 was P and that actually was right.

So- this works. Use it. You'll be surprised by what you can remember.