I remember reading of a mod that allows the summoning of all the creatures from morrowind, tribunal and bloodmoon. Could someone pleas point me in the right direction to finding the thing?

DarkDragon's http://planetelderscrolls.gamespy.com/View.php?view=Mods.Detail&id=483 looks like it does Morrowind and Tribunal critters. Have a rummage around using http://search.yacoby.net/.