You are very welcome.  Re: MPIO absolutely!  You won't have full redundancy, but in the meantime a nic or cable failure won't take you down.   re: Data / logs on different volumes is definitely what you want to do.  
I have just bought a Dell PowerEdge R520 with three Broadcom 5720 Dual-Port NICs. I am planning to boot Windows Server 2008 directly from a EqualLogic PS140E SAN and want to create four SAN volumes that correspond directly to four NTFS volumes. I just have a single Dell PowerConnect 5424 switch. Would it be recommended to have one NIC connection for each SAN volume or is there another preferred method?
How to present four SAN volumes to Broadcom 5720 dual-port NICs?