Atm, I'm only using few mods on-top of the soundmod, but are they cool!
My 2 favorites are the high resolution cockpits for the 109 and my own new fire mod for burning planes which uses the flames seen on the rockets/rocket-engines in the stock game. No more fireballs spawning from the damaged plane. :p
I need to get back to modding and figure out a way to make the flames of burning engines etc. to emit light, similar to when guns are fired. Would look darn cool in night missions. :hmm:
As for mods in general and what all is currently available, all I can say is WOW! With what the modders have to work with, it's just damn impressive to see what all there's been made already.
I see some ppl starting to work together on mods, so I'd say after few months we just might have first big mod coming.
Actually, I'm surprised how few bigger mods there has been. The coding stuff seems to be pretty simple, atleast the particle stuff.