@ Samuar
Didn't you get the "Technical Specifications" document? Log in to the Beta2 FTP server and download "docs/FrontPanel.pdf" (and "PegasosTechSpec.pdf", but it's the "FrontPanel.pdf" that contains the detailed info about the pin layout).
OK, I assume that you are mounting the motherboard into a tower case, with the ATX PSU connector "up", the PCI slots "down", the external connectors "left" and the Floppy and IDE connectors "right".
You will find the "Miscellaneous Connectors" (a lot of pins) just to the left of the Floppy drive connector. The "Power On" is the two pins furthest to the bottom (going left to right). The Reset pins are the two pins just above the power on pins (also left-right). Above the reset pins are the Power Led pins (also left-right) and above that you will find the HDD Led (also left-right). The Speaker connector are four pins wide, with the "Speaker +" pin Top Left.
Hmm, hope you understand. ;-)