My son is nearly 3, and he loves my iPad. He is very careful with it, and knows how to respect it. He has lots of games, some educational and some just for fun. He has already used it to learn his numbers, and thanks to this thread I have just downloaded a phonics game for him too!
But he also plays out a lot, cooks, draws, goes to pre school play group and has plenty of other play time. Everything needs to be in balance.
I grew up with computers, we had access to good computers very early on, and my whole (very sucessful) career has been based around being able to use the latest technology fluently and expertly. I want my son to be ahead of the pack (like I was) by having access to the latest technology too. We are a very tech driven family, with myself and my husband working in web, graphic design and system and web development.
Being a big geek in no way adversly affected other areas of my life.
I think my sons use of my iPad at nearly 3 is just the start of him learning to integrate technology into his learning. When he's old enough I will teach him to use photoshop and illustrator fluently, his dad will teach him how to design iPhone apps and if he has an idea, and wants to create it, he will have all the tools to hand.
On the other hand, if he wants to dabble in the kitchen, and create some recipes of his own, well I'm teaching him how to do that too. He's already brilliant with watercolour as I am an artist as well as a geek, and he makes a lovely Spanish omelette.
It's not exclusive, it's just another thing to learn. We will get him a laptop or tablet when he is ready.