The hot trend in music, at least from the perspective of playing an instrument, seems to be the ukulele. Why, exactly, is merely speculation.
In part it has to do with current pop songs like Train's Hey, Soul Sister incorporating the instrument. It may also be the fact that they are relatively easy to become proficient on and you can buy a decent one for about 50 bucks.
Youtube is exploding with ukulele videos. There you can find out how to play one and watch countless people showing off their talents.
The most popular ukulele player at the moment seems to be Jake Shimabukuro. Here's a performance:
I've been toying around with the idea of getting one myself but really need to concentrate on getting my guitar chops back.
Being able to play an instrument brings a joy like no other. If you've always wanted to learn to play something, this is about as easy as it gets.
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