glib has a GDate class for calendrical calculations, but also needs a way to deal with time. Fairly tricky to implement well.
Someone (happybob?) wrote regexp support for glib. This needs to get a final audit and then go in to the source tree.
Put support for command line argument parsing in glib. This should probably just be a renaming of popt. It's a larger task if you start from scratch.
Tim has a signal source for the main loop in bse, have to remember to get this in glib.