Not sure where the confusion is, the coloured GPIO diagram in the wiki is correct as far as I can tell?
Assuming you have the Pi oriented the correct way around, GPIO header is in the top left corner of the board. Then looking at that header, referred to as P1 on the board, pin2 is in the top left of P1 and should be 5v.
I can positively identify the +3.3 (P1) and 2 x +5V pins on the connector
This makes GPIO 1 on the header as the 6th pin from the left on the top row.
Yes, I can ID that as a GPIO pin.
You need to be aware that GPIO 1 on the R-Pi board is actually connected to GPIO 18 on the BCM2835. So in code what you would consider to be GPIO 1 is actually GPIO 18.
That's fine. Not concerend with that mapping for now.
I have been playing with this too and earlier today I posted in a different place on this forum, with some sample code which will hopefully make things a bit easier.
See this link for that post:
I hope this helps a bit.
I've checked it.
What I can work out is the other GPIO pins - so according to the Wiki GPIO0 ough to be adjacent to GPIO1 - I check that pin, and it is a GPIO pin (ie. I can make an LED flash) so far so good. Then GPIO7 on the Wiki - I see no activity on that at all.. but then I see activity on the I2C pins - probably because I've programmed them as outputs - may not be the best thing to do now I'm looking deeper.
Actually, I think it's that pin that's thrown me off - as that's the one I started with - all the others seem OK - just don't use GPIO7 on the connector (GPIO4 on the chip - marked GPIO_GCLK on the schematic) In that case I can use 7 IO pins - which might do for now.