The Nintendo DSi Browser is a web browser which is powered by either Yahoo or Google. It is based on the Opera browser. You can buy it for free through the Nintendo DSi Shop
Top screen displaying page overview, bottom screen displaying detail, or vice versa
No upload of local files
No Flash support (Some of the reasons is because the people use it to view adult material)
Limited Memory (Uses only System memory and runs out of room quickly, SD card use would make it better).
It does let you browse many sites and do searches, can click on links on touchscreen view. Slow and limited usefulness like many cell phone browsers, can't use SD for storage either, just system memory.