I got off the phone with VL Systems, the integrator who will be helping us out with our EqualLogic SAN integration, and they suggest that I not use the Intel Pro 1000/PT quad port NICs for our iSCSI implementation. Doesn't have TOE or iSCSI optimization. doh.
Although it does not support TOE natively, when used with dual quad core xeons, it should be enough to keep up. We're going to run some benchmarks when they come do the install.
In the mean time... I need to find a suitable iSCSI card in case it does not live up to performance expectations. Something with a Broadcom chipset such as the HP NC380T but not HP. Dell servers do not like HP NICs.