ok ive just got my ds lite today and im interested to know what i can do with the wifi? is it possible to connect it up to my wifi dsl router, if so how? If this is possible what can I do with it then? ie surf the inet?
If all you have is a DS Lite, then you can't do a thing using Wifi. If you get a Wifi game (eg Mario Kart) you can play against people over the internet. If you get the Nintendo DS Browser (aka Opera) you can browse the internet. If you get a homebrew device you can check your emails, get weather forcasts, and use IRC/MSN/AIM.
A homebrew device is a hardware cartridge which allows you to run home-made programs & games on the DS (as well as RMs). There is a large selection available (M3/Supercard/EZ-Flash...) I believe there is a guide on these forums which will give you more information, I will update this post when I find it. UPDATE: Found it: XBuyer's Guide for the Confused and the DS NewcomerZ
oh right, well ive just ordered a R4 DS for my ds lite so that should do it. so does anyone know of a msn app for it?
Yes, in the download will be several versions. The no-fat version does not access any external files in the storage area and should therefore work on everything. It is likly the Chism version patched with DLDI could also work, but it's too much effort compared to just copying the no-fat version across.