The epic modders over at Morroblivion just released the first alpha build of Skywind, a mod that will let you play Morrowind inside of Skyrim. Right now you can't do any questing, but you are able to walk around the world and explore. This mod looks absolutely fantastic, and I can't wait for them to have it all finished.
I love Morrowind, and I always have it installed on my PC, but even with mods like the Morrowind Graphics Overhaul and Morrowind Rebirth, it still looks insanely dated. It came out when 3D games were blocky and awkward, and it's hard to mod that out without tossing out half the assets and using a new engine. Thankfully, with a PC game as open as Morrowind you can replace half the assets and use a new engine.
This mod requires you to own and have installed Skyrim and Morrowind with all of it's expansions.
Skywind v0.9 Released! [Morroblivion]
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