I've compiled a list of high resolution texture mods for Oblivion here; it also includes instructions on how to configure OBGE. I'd love to know how complete it is:
http://knotstheinane.blogspot.com/p/oblivion-modding-guide.html

I've also done a guide for Morrowind:
http://knotstheinane.blogspot.com/p/morrowind-modding-guide.html

Oooo! I feel like re-installing Morrowind after seeing this guide! Thanks Knots