Definately can be done.
You will need a wireless connection that has no protection or WEP 64-bit protection enabled (e.g not WPA). You will then need Opera for the DS (see ) or a download of it and a memory expansion card (something like this ), if you have an R4 or similar card.
Boot the opera and then click on internet settings (should be able to use automatically find and then add any keys needed), and set up the internet same way as playing a game and its settings. See page if you have problems setting it up. Only reason I did it was when I was looking up work items at the Library at Flinders Uni (wont work at Adelaide, due to WPA) and I couldn't be stuffed going back to my office laptop!
Then you can use opera to surf the internet, but let me just say its a lot of work for an awful setup/browser.
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