Although there is no long term studies about how technology is effecting early childhood development, we are beginning to find smaller short term studies coming out like this one.
Also, here is another link to an article I posted on my blog in 2011. It is entitled “Parents Urged Again To Limit TV for Youngest” and at the end of the post there is a link Michael Krasny’s show Forum, where they discussed the first long term study that is underway.
In response to these thoughts, this article from Wired Dad takes the top prize as my favorite article as to what toys are actually best.