Here's my dos centavos:
If you are no longer getting nervous before hitting the stage, to me that means you no longer care. The nerves imply that you still want to do a good job, impress people, and put on a good show.
The best thing I can say though is that by putting in the work before the gig, and going on stage knowing that you have the songs down 100% as a band, there is little to fear that is within your control.
Stuff will happen, mics wont work, voices will crack, a wrong chord will be played, lyrical mind blanks, cymbals stands will get knocked over, and some a-hole will yell "FREEBIRD". The only question is how will you deal with it. If you let it get to you, you can kill your whole set, however if you simply say "Well that sucked" and move on, most people wont even remember it after the next song.
Tell drummer guy/gal to relax. The audience is letting you know that they are rooting for you simply by being there. They are on your side, unless you give them a reason not to be.
I hope this helps in some way.
