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The heart of the beast, underneath is the 915G Northbridge which handles all primary mainboard functions like CPU and memory. I'm surprised not to see an active cooling solution. Good, one less fan that is making noise! On the mainboard we have two chips that control everything I/O related. We call them the north and southbridge. The northbridge is what you see cooled here, it's responsible for the processor, PCI-Express bus, memory and thus very primary funtions. The Northbridge is cooled by this huge yet silent cooling sink.

And here we have the Southbridge (ICH6), which again is cooled down with a heatsink. The heatsink is definitely needed as this baby is getting hot alright.

The Southbridge is responsible for secondary tasks like natively supporting four Serial ATA ports, USB, LAN and up to four PCI Express x1 slots, or six regular PCI slots. If your Southbridge is the ICH6R chip then you are in luck, it also supports RAID modes 0, 1 and 0+1 and that lovely 8-channel sound. All the way to your right you can see the Serial ATA connectors. They are very close to the Southbridge, which makes sense, the Southbridge is controlling it. And for high-speed optimal data integrity you want your data paths as short as possible. Clever to say at the least. 

Oh yeah baby... 1, 2, yes 3 PCI slots.

When we move the camera position a little we can see the x16 PCI express (red) slot and next to it are the two (blue) x1 PCI Express slots.