Some info on the Wings card connectors, along with an interesting hack, here.
The PCI looking thing is probably the modem slot. It's similar to a Comm slot AFAIK. And yes, the SGRAM slot is for motherboard VRAM - you can upgrade it from 2MB to 6MB with a 4MB stick. I recommend you do if you're using onboard video. Same 4MB stick as goes in the tray-loading iMacs.
The onboard Ethernet is 10/100, so unless it's broken, or that card is a gigabit card (and you have a gigabit LAN) you don't need it. There's one PCI slot freed up (and some ebay buck$), and a generic combo USB/Firewire card will free up another.
The PCI looking thing is probably the modem slot. It's similar to a Comm slot AFAIK. And yes, the SGRAM slot is for motherboard VRAM - you can upgrade it from 2MB to 6MB with a 4MB stick. I recommend you do if you're using onboard video. Same 4MB stick as goes in the tray-loading iMacs.
The onboard Ethernet is 10/100, so unless it's broken, or that card is a gigabit card (and you have a gigabit LAN) you don't need it. There's one PCI slot freed up (and some ebay buck$), and a generic combo USB/Firewire card will free up another.