Kitsunekaboom said:
There aren't any real particular powers or abilities unique to them.
No, however, they differ from standard elves by these factors:
Ability adjustments are -2 Str, +2 Dex, -2 Con, +2 Cha
Favored class is fighter, not wizard
Their eyes are freaky -- the white is actually black
Their clerics can't cast spells higher than level 3 (this latter tie-in to the rest of their curse and why they are forsaken).
Alzrius: FR elves are different breeds than the "default" races and subraces, because of differences in height and pigmentation (skin, hair, eye colors). Their niche and important stats* may be the same, they still have different aspect.
(* Sun elves and grey elves actually have stats differences, since greys have -2 Str +2 Dex -2 Con +2 Int, while suns have -2 Con +2 Int. Also, since moon elves are sometimes nicknamed grey elves and sun elves are sometimes called high elves, it may stir up confusion.)