Attention, FSX-pilots! One of the most popular tools for FS9 is close to release for FSX as well, "Flight Environment". FS9 users having it I must not tell how great it is, all newcomers be advised that it massively boosts/replaces textures for the displaying of weather, clouds, sky and water. Dedicated website is online now, check the screenshots! If it does for FSX what it did for FS9, it is a must-have.
http://www.flightenvironment.com/gallery.html