Greetings capts, hope Captain Sim don't mind I share this to you here.
I just found this, if it's new to you have fun.

There is this freeware program FsRaas V2.0 (Runway Awareness and Advisory System for FSX/FS2004) that has runway no. callouts and a lot more. It's pretty cool, and freeware although I'd pay for it like many others maybe. All you need is the latest version of FSUIPC from the web page we all know, and that's it. I've tested it and works flawlessly when I'm in the runway, approaching it, etc.

Look at this video for more details if you're interested
http://www.youtube.com/watch?v=wDlIMjAUn0s

So yep, see you!

Rigo