I like reading hacker's blogs, tweets and forum post. Are there any notable DS/3DS hackers that I can follow on twitter or that have blogs?
As far as the DS is concerned, there's not much there to hack anymore, but you can follow Team Twiizers if you'd like.
For the 3DS, I recommend reading up on 3DSBrew, that way you'll be following the exploits of numerous hackers rather than just one particular group.