@sivan: looks great, you've really put a lot of work into this
A good visual improvement is tonemapping (but it needs an hdr image input)
Maybe that's something you want to implement.
But it needs to be used right, otherwise it won't look that good.

@oliver some use a second deferred pass for transparent objects (only ONE layer works with this) but atm. I don't know any AAA game which does that, however the most are doing exactly the same as me. With the right object shaders it actually looks good, but with acknex-default-lighting it doesn't