Together with the release of InterNestor Lite 1.0 Konamiman released Inlib, an InterNestor lite development library which can be used with SDCC (of which an MSX-DOS backend can be found over here). With this library you can use all features InterNestor Lite has to offer in C. Sounds like a perfect excuse to grab your C compiler and join Ilac'04.
Relevant link: Konamiman's MSX page