Check raising is one of the first tools every player learns, from the idea of checking when you are weak to betting when you are strong.  In this case, however, you check when you are really strong and then, when your opponent stabs at the pot, raise him massively.  How can we extract the most from this tool, especially in the hurly burly of the online poker field, with its share of people labeled as "calling stations" to elephants, jackals, bluffers, and lions?  As is well documented in poker books and other literature, the primary skill separating the beginner poker player from the intermediate is "reading ability," and this encompasses the ability to smell out weaknesses in a players continuation bet, perceiving when a so-called check-raise is really a bluff, or when a player is checking a monster.  While this can only be gained through experience, here are a few pointers that rely on check-raising, to help the beginner.  

It is often a good idea to check the flop to an aggressive player, to see where you stand.  While this may seem counter-intuitive, violating Greenstein's concept of defining your hand when you flop something by betting out or checking when you are weak, it is actually a very powerful concept.  Based on the aggressive player's reaction, including such vital tells as how quickly he bets, what size his bet his, and how his betting patterns fit in with his past hand history, as well as, above all, the texture of the flop, you can gauge exactly where he stands.  You should initially put him on a range of hands, based on his past history and his pre-flop behavior at the table, and then, analyze how these hands, derived from Harrington's "Structured Hand Analysis," or SHAL, would connect with the flop.  You should analyze how a player would frequently bluff at a rag-rag-rag-flop, based on what his preflop holding was.  For example, if you hold pocket 7s on a flop of 10-8-2, and your opponent comes out betting after raising preflop, and you can categorize him as a loose-aggressive type player who frequently takes stabs at pots, you can probably put him on a bluff since this fits in with his pattern of loose-aggressive, continuation-type betting after the flop, and put in a massive raise to see where you stand, since he almost certainly holds two unpaired high cards based on his moderate raising.  This system of play requires very sophisticated reading skills and so can not really be recommended to beginners, but its skills are still accessible to inexperienced poker players.  Above all, the inexperienced player should remember that 66% of hands miss the flop completely, and so when a loose-aggressive jackal is continuation-betting after every flop, you should pick your spots, and sometimes check to him when you think you have the best hand, based on your analysis of his likely preflop behavior and, most importantly, the texture of the flop.  When he puts out a continuation bet, you can sometimes place him on a bluff based on your read of him, and check-raise him, making him think that you are just making a stab the pot without a legitimate hand.  When this ensues with a raising war, you can sometimes profit in spades.