<a href="http://hem.passagen.se/flubba/gba.html" target="_blank" >FluBBa</a> has updated his PCEngine emulator for the GBA (works on Nintendo DS - with a GBA Flash Cart - and Gamecube Gameboy Player too ), heres whats new
V7.4 - 2005-08-18 (FluBBa)
Added Black'n White mode to games that support it.
Fixed Arcade card emulation (on EZ3 cards).