in my old 33k modem days it was BeOS5 at 33mb and zelda64 at about 40mb, also Euro2000 demo at 44mb.
with my 112kps its stuff like 70-80mb, like transformers episodes (DivX70mb), soundfonts (fluid 80mb), Roms (GmotW neo geo ,50mb,)
but thats about it, if i ever see something BIG and with clean access, then yea if its good ill go for it.