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Strum Strum instantly turns your 15-second video clips into rock-and-roll masterpieces. The new video app comes with built-in filters, and when you add them to your video, they'll transform it into anything from a rap song to a love ballad.

Soundtracks are customized for your particular video, so even if you use the same filter on two different videos the results will likely be much different. The app has more than 20 different filters, including several themed filters for the holidays.

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Click here to view this gallery.

It can be tough to keep up with all the new apps released every week. But you're in luck -- we take care of that for you, creating a roundup each weekend of our favorite new and updated apps.

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This week we found an app that lets you create a movie video on your phone or tablet in just a few seconds, and a popular service for watching videos made its way to even more devices.

An app that lets you hail a cab directly from your smartphone rebranded itself this week, adding some new features in the process; and a popular mapping app finally made its way back to the iPhone.

Check out the gallery above for a look at this week's app highlights.

If you're still looking for more, check out last week's Apps You Don't Want To Miss .

Think we left a great new app off the list? Tell us about your favorite new apps from the week in the comments below.

Photo courtesy iStockphoto, scanrail

This story originally published on Mashable here .