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fill your slots every other till the end, then fill from end towards AGP. like this:
AGP card, skip first, fill second, skip third, fill fourth. then fill fifth, then third, and finnally second.
most motherboards are set up so that any shareing is does in such a way that this patern works well.
also, if you are filling up all slots, be sure to put high bandwidth cards shared with low bandwidthcards.
For example, dont put a RAID card in a shared slot with a sound card. put RAID or sound with modems, or USB1.1 cards, or printer cards.
hope this helps