Yep, Ikarius is correct. Wifi is something that I am looking at right now too (lots of fun stuff). So, hopefully it will be in version 0.5 or 0.6. The problem I have now is that it's hard to test your program without another DS, since none of the emulator has wifi support yet...
While we are on the topic. Which way do you guys prefer:
a) a simplified list of functions like
PSP's LuaPlayer (which is TCP/IP only)
b) or a more complicated list of functions that allows additional flexibility (TCP/IP + UDP)
c) both...

Thanks,
Waruwaru