other languages: Italian
Gimp is a free application for drawing and image editing.
GIMP is like a professional tool with many features and in no way inferior to professional applications like Photoshop, CorelDraw, etc.
See the official site, e la official documentazione.
On Internet there are many tutorial that explain how to use GIMP. There is a list of those of my interest:
Tutorial
Logo 2.0 con GIMP (IT), HTML.it
Web 2.0 Text logo (EN)
Gimp Tutorial: Logo-Design ( DE ), YouTube video
Creare un bigliettino da visita con GIMP (IT), YouTube video
Create a grunge business card using GIMP (EN)