An update from the Nintendo DS Browser, the DSi Browser has better availability with all the features from the first one
First, anyone with internet access on their DSi can get it for free. The previous version cost $35 for retail sale, and you had to own a DS Lite to get it. Otherwise, you'd have to buy it off of the Nintendo Online Store. This version is now available to anyone who owns a DSi with internet access, making it more likely to receive updates.
Secondly, it's much faster. Though it's still not the fastest, loading sites with lots of pictures could take up to ten minutes on the Nintendo DS Browser. So long, in fact, that it provided a feature to load sites without the pictures. On the Nintendo DSi Browser, the feature has been removed, as it's no longer needed, thanks to the RAM that the DSi features.
That's another great thing about the Nintendo DSi Browser. It has the ability to take advantage of the DSi's better hardware, instead of dumbing itself down to support older versions of the console.
The Nintendo DSi Browser also copies the looks of the Internet Channel, the web browser for the Wii developed by the same people. The buttons are bigger, more spread out, rounder, and are nicer looking than the ones from the Nintendo DS Browser.
Another nice feature is that it gives you two viewing options: A normal mode and a "Single Column" mode. In the normal view, you see things just like you would on a normal computer, and use the stylus or D-pad to pan the screen. In Single Column mode, the Nintendo DSi Browser compiles everything into one column. This is especially useful for sites like Wikipedia with lots of text and not a lot of formating, because you don't have to pan back and forth to read the text.
The only issue that I have with the Nintendo DS Browser is that it lacks a few minor features from the Nintendo DS Browser, such as being able to use a web blocker, or being able to zoom in and out on the page. Another issue is that it uses the Opera engine, which makes sense, because it's developed by Opera. However, this can become a hassle sometimes, because Opera isn't main web browser, and therefore, some sites have features that aren't supported by the browser.