I'm with Qarl, some sort of Matrix rezzing textures instead of grey goop would do a little bit. Also for the viewer to rez things closer to you as first priority would make sense, and an option to right click on an object or an avatar to change rezzing priority.
Been beating the drum for a while on the SL registration API and dropping people off in their sims, make it happen!! If you build it, they will come! :)
