PCB layouting

lots of thing have been going recently. I've started a new project: a digital polyphonic synth based on an atmega16 ic (pics and vids soon). I was looking for a good schematic and pcb designer software. After a long search and much hairpulling i finally decided to use an open-source package called gEDA. Although it has some small bugs it's much easier and less complex than many commercial options.
I've now (nearly) finished the layout of the sequencer master part. Here it is. I've noticed that (clever) layouting pcb's is a quite demanding task..
Please don't etch boards with that layout yet (that's why i didn't put the resistor values..) i have'nt checked and tested the layout yet