I got my new DSi for Christmas from my wife. I have had all the Nintendo handhelds so naturally this begs comparison with the DS Lite.
The I in DSi is for Internet. I like the internet browser but it leaves a lot to be desired. I can surf the internet to mobile friendly pages and check sports scores and check my Facebook page and check the weather but that is about it. Downloading web pages is very slow and, of course, there is no flash or video. The main purpose of the internet feature is to give the ability to purchase games online. I think that downloading video games off the DSiWare site is a neat idea but all the games I have looked at on the site do not appeal to me. There are no free games on the site either. It would be nice if you could download free demos of games.
I love the SD card slot. I love having music on my DSi and using it as a music player and the animations that they have during the music are a lot of fun. Music capability is something that I had wished for in the DS from the beginning. I wish that you could listen to your music while playing games the way you can with a Playstation or Xbox.
Some people have said that there is enough memory in the game that you do not need to use the SD Card slot. I guess that is true depending on how you use the game. If you want to surf the internet with the built in browser you will run out of memory quickly loading even the most basic pages. When I got the game at Christmas I took about 20 photos and then tried to use the internet and kept getting out of memory messages. Then I transferred all the photos to an SD Card and the problem went away. Also, if you want to listen to music you have to use an SD card. If you download any games off DSiWare site I would recommend you have a memory card and a pretty big one at that.
The camera is kind of neat. I love that the DSi has Facebook integration so you can take pictures with the camera and upload them directly to Facebook. The camera is poor quality and there is no flash. I like that when you turn the game on it greets you with a different picture from your photo gallery.
I hate that they got rid of the Gameboy Advance slot from DS Lite. I had always kept Star Wars Trilogy: Apprentice of the Force
in the GBA slot so wherever I went with my DS Lite I had at least two games with me to play. Also, now I will not be able to use my rumble pack for Star Fox. Of course, there were whiners that were mad they could not play their old black and white Game Boy games on DS when it first game out.
I really hate the lack of wireless security with DSi. It advertises on the box that the new DSi supports WPA2 AES and WPA / TKIP pre-shared key authentication. However you cannot use this with any of the games. The only wireless security supported is WEP.
Many people griped about the poor quality of the camera and it is true that is is not a very high quality camera. However it is a lot of fun to take pictures with the DSi and there is photo editing software in the DSi that you can draw mustaches and funny hair etc. on people. My daughter loves it. She can play for hours with this feature of the DSi alone.
I also downloaded a great game from DSiWare PHOTO DOJO. It is a fighting game where you create characters by photographing yourself in fighting poses and recording your own sound effects. I have had so much fun with this game. I have bought costumes to create more characters. My daughter has also made charaters. You can play the game against the computer or against other people. And it is one of the least expensive games on DSiWare site.