this DS lite that you are talking is about $140
Yes you can play Nintendo DS games on a Nintendo ds lite.
Yes, the original Nintendo DS as well as the Nintendo DS lite can play NDSi games.
Yes, you can use ds lite games in the original Nintendo ds. They are not making new specialized games for the Nintendo ds lite. they are still making games that fit both the original DS and the Nintendo DS Lite.
yes they do
If you are asking if ds lite games will work in a sp the the answer is no.
no you can only use Nintendo games on Nintendo ds/Nintendo ds lite.
no
No. There is no way to download or play DSiWare games on Nintendo DS or DS Lite systems.
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You can't download games onto a DS Lite.
The Nintendo DSi is just an upgraded version of the Nintendo DS and DS Lite. The Nintendo DSi plays the exact same games as the Nintendo DS and DS Lite and only plays DS and DS Lite games. Currently, there aren't going to be any DSi games, only more DS games.
If you mean simply trading one system for the other, then no, you cannot. The Nintendo DSi is worth about $150 while the DS Lite is worth about $110. You can, however, trade in the Nintendo DS Lite and cash for the Nintendo DSi. If you choose that method, you will need about $40 or so more to cover the cost. You can also choose to trade in your Nintendo DS Lite plus a game or two for the Nintendo DSi.