Interesting teaching technique
I just learned from CLENExchange another teaching technique that sounds like a great one to combine with the jigsaw technique. It's called Pecha Kucha, a 20x20 presentation where students develop 20 slides and each slide gets 20 seconds of presentation time for a total of 6 minutes and 40 seconds.
I could see a variation of this working with a jigsaw exercise where each group of learners is asked to review something (such as an article, database or website) and then is given a certain amount of slides and minutes to teach the rest of the class what they learned. I could see asking a couple students to keep time and using a cow bell or some fun beeper to pull people off the 'stage.'
Give it a try!