Here's whatsnew per the homepage:
Pictochat is now successfully exchanging authentication and associations requests and responses. After that, on real hardware, the host should immediately send data frames (via port 090h presumably), in no$gba, the host doesn't send any such data frames for whatever reason (only the client does, via port 094h). Info on fixing that problem would be highly welcome. Built-in help text (in debug ver) contains almost complete wifi specs now.

Get it here:
http://nocash.emubase.de/gba.htm

-Trebor