This site offers lots of fun classroom gadgets. I especially like the "Fruit Machine". You can copy and paste a list of words in the machine and it will randomly choose one. You could have your students define these words or categorize them. You might even input your class roster and use it to pick lab partners.
Don't forget to explore other cool tools on this site as well.
http://classtools.net/education-games-php/fruit_machine/
