I miss it too, but every time I think of playing it again I remember how lame it got.
Ah well. Maybe they'll do a half-life 2 WFA mod (seeing as the source is already out and all).
A Navy game? What would you do? Practice drownding?
I guess it could be naval battles.. maybe one carrier fleet against another? People controlling each ship (and each battery on a ship) as well as aircraft. Maybe something kinda like BF1942, but only on the water? Gawd, a game like that would last for freakin' ever.