have been playing with several settings for quite some time, end these seem to work best for me. i know where are several topics on this issue but most (imho) are playing/sertting the wrong settings. For me these took care of the shadows problem and Skyrim still looks great

[Display]fShadowLODMaxStartFade=3500.0000fSpecularLODMaxStartFade=3500.0000fLightLODMaxStartFade=3500.0000fSpecularLODStartFade=3500.0000fLightLODStartFade=3500.0000fShadowLODStartFade=3500.0000fSunShadowUpdateTime=-1.0000fSunUpdateThreshold=-0.5000

[Grass]fGrassStartFadeDistance=7000.0000fGrassMaxStartFadeDistance=7000.0000fGrassMinStartFadeDistance=400.0000

EDIT:
forgot the most important. Put a - (minus) infront of those two

fSunShadowUpdateTime=-1.0000fSunUpdateThreshold=-0.5000

Hope this will help, Im still trying to get the best balanced settings to add them into the Skyrim CFG maker

Thanks will test this out and post back later how it goes.