The Lungs of HellWell being the Lungs of Hell and all it is pretty hot but also happens to have some very useful Megadeth info.
Mikeal's Megadeth Page
Mikeal has done a splended job. Tons of great stuff and undated frequently.
Megadeth ZoneAnother sweet page with tons of stuff and a cool layout.
Amir's Megadeth PageCool site with a little of what looks to be some homemade flash stuff so you'll need a flash plugin but the site takes forever.......... to load.