Hello Guys.
I am pleased to announce that in the next few days I will publish the new pinouts 
Something that I think really needs to be changed....
You have the interrupts labeled as the Atmega datasheet calls them. BUT BUT BUT Arduino changes the names of the External Interrupts.
Example:
Arduino Mega 2560 Pin: 2
Arduino Mega 2560 Interrupt: INT0
Atmega2560 Pin: 6
Atmega2560 Interrupt: INT4
So you list the interrupt names how it is named by the datasheet, but that is not very helpful when trying to set up the interrupt in Arduino! It took me a while to figure out that Arduino changed the names. I think both should be shown on your diagrams.
Thanks!!!! 
Thanks for the note.
At this time I'm very busy but I see to find the time to update the pinout.
Ciao,
Alberto
Pin 6 is not PCINT8. Pin 0 is... I just found out the hard way 
Mhm, did not answer....did he found it out the hard way ? ]
Fortunately I downloaded the files linked in here just a day or two before the server pighixx.com, that hosts the pictures linked in here, went down.
Link off...
Someone could post on a different server pls ?
Here you are: http://greentechhobby.com/images/Arduino/
http://greentechhobby.com/images/Arduino/ArduinoMega.pdf
http://greentechhobby.com/images/Arduino/MEGA2560.pdf
http://greentechhobby.com/images/Arduino/atmega2560u.pdf
After a long time I came back. smiley-grin
I'm redrawing all cards with a new graphics. For those who follow me on twitter is not news!
Here the pinout of ATMEGA2560 shortly the Mega pinout
pighixxx:
After a long time I came back. smiley-grin
And not before time either! We really missed you.
What happened, anyway?
{The (real) world does not run on Twitter.}
A lot of things happened!
Quietly tell you everything, certainly there will be good news.
Paul__B:
{The (real) world does not run on Twitter.}
Monday I release a new version of the mega pinout that corrects some errors.
New Mega pinout available.
v3.1 - IDE pinout, bug fixes.
The download link is the same: http://pighixxx.com/megapdf.pdf
I cannot express how grateful i am for the nice pinout sheet. you saved me like 2 hours of nerves Have a nice summer
So glad you are back! I was just looking at a mega diagram you drew in Jan. 2013. The Arduino pins were not marked on the diagram so I started searching
Here is something I did: I tried to shrink my printout and got an exact 1:1 match to an actual mega on your diagram, if I use Letter size paper (USA) and choose in Acrobat reader print menu "Fit" and then go into the printer properties menu and change the scale to be 79%.
I didn't print in color and I am using a third-part compatible board 
Hi
I cannot download the picture, the link to the site just get stuck at 99% complete message
Any other links to the page?
Thanks
Hi,
the right link is on the first page.
btw,
atmega2560: http://pighixxx.com/atmega2560v3_0.pdf
mega: http://pighixxx.com/megapdf.pdf
Pighixxx
There is a mistake on your drawings.
On Jp5, you define pin PB4 as T1
After trying to figure out why I could not clock T1, I checked the datasheet.
T1 is PD6, and its not connected to any header on the arduino.
On my case I defined PD7 as an input and soldered PD6 and PD7 toguether.
Good work with your drawings other than the above they are fantastic!
Hi casemod,
that connector (JP5) is not connected to ATMEGA2560 but to ATMEGA16U2 which deals with the usb serial communication to the main processor (2560). PB4 on 16U2 is PB4/PCINT4/T1 and is connected to pin 18.
liudr:
(cut)
Here is something I did: I tried to shrink my printout and got an exact 1:1 match to an actual mega on your diagram, if I use Letter size paper (USA) and choose in Acrobat reader print menu "Fit" and then go into the printer properties menu and change the scale to be 79%.
(cut)
Hi liudr,
next week I publish all cards in 1: 1 format
Thanks to all,
Alberto