I like to check raise with big draw hands - gives you a chance to win the pot right there, disguises your hand a little if you hit after being called, gives you a better chance pick up the pot on the turn if you miss.

Also it's a good change gear tool - if you've repped a lot of flops but not shown down lately, people may be unimpressed by yet another continuation bet, but very scared of the CR because they haven't seen it.