Korea Tip 105: Anki - Free (Language) Flash Card Program

Anki is Japanese for memorize.  Originally developed in Japan, for learning the Japanese language, now Anki has evolved into a multiple use learning program.  It is basically an advanced flash card system. 
You input (or download) the flash cards.  Then, upon review, Anki shows you one side of the flash card.  You mentally or orally recall the answer.  Then, you grade yourself on how well you answered: (1) incorrect, (2) difficult, (3) good, (4) easy.  Anki records your answer and brings that card up again quickly or slowly based on your self-evaluation.  Cards which you have learned extremely well only return for review about once a year. 
I use Anki to study Korean 3-4 times a week.  I have a few thousand cards entered.  Because, I input both single words and complete sentences, Anki has helped me to build my vocabulary and grammar. 
One of the hardest parts of language learning is that the ocean is so vast.  However, if you practice your Anki cards regularly, you'll only get a bite-sized chunk of cards for review each day.  This really helps with the motivation factor.  I keep myself going by alternating between Anki and email. 
Anki is an internet based program, so it automatically syncs between computers and phones.  If you do 10 cards at the office, 20 cards, and home and 30 while on the bus, none of them will be repeats - unless you missed them.
I highly recommend Anki.  20-30 minutes a day will make a big difference in your language ability.  You can download Anki for free here.