Stakes, I just asked some questions about files placement on a SAN in this post

here. It might be useful...or not.

I typically put temp log in with the other log files and drop tempdb(s) on a separate lun. If it tempdb is expected to get hammered then you might want to go with option 2.

If the disk groups in you SAN are dedicated, you can also adjust the queue depth to 64 or 128 on the HBA. I believe the default is 32. If the disk groups are shared disks, you may not want to go higher than 64, as this could affect performance for other servers using the same disk groups.

chris