Thanks for the tip, D.
I've just made a new version of the layout. I think now it's clearer and more estructured than before. I still have to polish some details, like menu text font, which I don't like so much (it does the job, though

).
I'd appreciate your feedback on this.
This is the URL for a hi-definition snapshot
Code:
img222.imageshack.us/img222/2416/version2shotzz2.png
I don't know why fireworks saves plain PNG with loss of quality compared with the other... if anybody knows it will be great.