kids can use all of the technology stuff at the local public library. you don't have to buy any of it! using it at the library is self-limiting, too. libraries have limits, like 30 minutes at a time. or things you check out but have to return. so the kid can get some "experience" with the electronics, minus the addiction to the electronics.
my DD is almost 7.5 years old, and we don't do any of the fancy electronics. just a little TV, some DVDs in the van. i'm teaching her how to shoot professional photographs with my expensive digital camera, and will show her how to edit images on the computer. she's interested in having some sort of tablet to play around with for artistic projects. i *might* look into that as a Christmas present, provided that it's only $100 or so and limited in what she can do with it. she is allowed to play certain games sometimes on the computer, those we find on pbskids.org -- for example. we watch educational videos together on the computer on BrainPop. she has a math program called ixl.com
as far as Wii -- no interest, no time for this. she stays active in real life athletics like swimming, cheerleading, dance, gymnastics. i have to admit, i don't even know what a DS is.
when she has time for play, she pulls out her My Pretty Pony collection, or her Littlest Pet Shop box, or plays with her dolls.
she and her little brother have an extensive dress up closet of costumes i have acquired over the years, mainly through Good Will type stores. they love to dress up, and are into that closet all.the.time. i'm annoyed at how often they leave their costumes off the hangers.
and this is a little off topic, but i would like to point out that electronics *seem* to be a vital necessity, that kids have to keep up with the latest and newest in order to "survive" -- but i don't think it's true at all. a little goes a long way, and they are natural whizzes at figuring stuff out on cell phones, etc.
i think that what children need for their long term "survival" is knowledge of how to do stuff like grow their own food, understand principles of nature and the natural world, get experience relating with all kids of other people, learn to budget money and manage a home, and take care of children, and even aging adults. all of these factors WILL necessarily be a part of their lives. we in the united states have been living "high on the hog" for a long time. there is no guarantee that our children's future will include ready access to wi fi and electricity at all.
my advice, which admittedly you can take it or leave it, it's just my perspective -- my advice would be to just ignore the tech world aimed at children and go about parenting your child as if it didn't exist at all.