I use Intel Pro/100S Dual, works great. have 3 installed i one box. --- Increase the flexibility and scalable bandwidth for your workgroup and departmental servers that have limited PCI slots. With two 10/100 Mbps ports on one card, each adapter delivers up to 400 Mbps for twice the bandwidth per server slot. Encryption offloading on the adapter helps protect data while conserving CPU resources Intel® SingleDriver™ technology simplifies installation and maintenance ---
I usually use the D-Link 4port nics in ASL when I'm faced with needing multi ports on one PCI slot. They keep up with the 802.11b wireless gateway just fine. We haven't had the chance to run it through it's stress test by maxing all 4 ports at 100% but it does handle a school district without flinching while utilizing the full usage of the wireless connections.