What is a good easy to use camera for an older person?

I am looking to buy my grandparents a digital camera, I need to know what ones are user friends and have large screens and buttons. I am not looking for anything fancy at least 6 MP. Maybe something under $400. Does anyone have any suggestions or can you provide some links to reviews. Thanks so much.
Edit: My Grandparents are quite computer savvy for their age so the software portion will not be a problem for them. I am just having problems picking a camera for them. Great suggestions so far.

I bought this one for my mom for mother’s day (Canon Powershot A590 IS):

http://www.usa.canon.com/consumer/controller?act=ModelInfoAct&fcategoryid=183&modelid=16336

Olympus FE-3010 Digital Camera

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Aktiv Pak 400 AP400 Camera Backpack $65.49 Aktiv Pak 400 Camera Backpack is lightweight and easy to useCamera accessory can fit a surprising amount of gear as well as providing necessary padding and protectionCamera bag includes all-weather rain cover

Olympus FE-47 14MP Digital Camera (Refurbished) w/Bonus Accessory Kit $71.99 The FE-47 is the ideal choice for anyone who wants an easy-to-use camera that takes crisp, clear pictures. With features like a 5x zoom and Intelligent Auto, the FE-47 makes taking pictures fun and easy for everyone.

Canon EOS Rebel T3I 18MP DSLR Camera/ 18-55 IS II Lens/ Pro 9000 Mark II Printer Kit $1154.99 Photographers looking for an easy-to-use camera that will help them create their next masterpiece need look no further than the Canon EOS Rebel T3i.

Olympus FE-47 14MP Digital Camera with 2GB Kit (Refurbished) $85.49 The Olympus FE-47 is the ideal choice for anyone who wants an easy-to-use camera that takes crisp, clear pictures. With features like a 5x zoom and Intelligent Auto, the Olympus FE-47 makes taking pictures fun and easy for everyone.

Olympus FE-47 14MP Black Digital Camera (Refurbished) $76.99 The FE-47 is the ideal choice for anyone who wants an easy-to-use camera that takes crisp, clear pictures. With features like a 5x zoom and Intelligent Auto, the FE-47 makes taking pictures fun and easy for everyone.