after using Hot Potatoes activity

I practiced Hot Potato activities by making some kinds of JCloze, JCross, JMatch and JMix quizes.
I think it could be a useful material as a check-up quiz after learning some vocabularies or expressions. 
Thesedays, there are many computer assisted language learning resources.
I usually use them in my English class,because they are convenient and effective, but some teachers say we shouldn't use them too much. Sometimes I also think so, because Korean students are too often exposed to computer assisted learning. I need to find out some new interesting and useful sites,and you introduced me some of them.
Thank you, Jeff ^^*