If you do, iWIll has the board for you.
The Inquirer has an article posted from the CeBit about iWill's new servers boards that support 16 DIMM slots.
Quote:
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The DF88 was the one that surprised me the most, it has 8 DDR channels per CPU for a total of 16. It can run with all slots at DDR2-533, ramps down to six at DDR2-667, and a total of 4 at DDR2-800. These are per channel, so double it if you are looking at the number of DIMMs per board.
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When you care enough to put 32GB of memory in your machine...
Source:
The Inquirer