Ok, I made some tests, yes with Outline font it is possible to rotate text, the problem is that with this kind of font I can't work in 2d space, or I'm not able!
Seems that when I use the glOrtho function to create the 2d transformation, the text becomes very very small!
If you look in this example, when you press the Ortho button you see that the text (or what I think it is) very very small in the bottom left of the window!
I need to work using pixel coordinate and not spacial one!

http://www.abulafia.it/temp/OGL_SimpleNF.zip

Thanks
Lorenzo