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EDIT: I have heatsinks on back of all boards in regulator area, and 120 CFM fans!

Does the backside of the regulator even get hot? I have felt the top of the chip and its very hot but I don't feel much on the backside. Wouldn't putting a small heatsink on the chip do more?

For the hashing chips those thermal vias work well as even touching the vias themselves gets hot, even better with a heatsink.

Yes, it gets quite hot. I believe they are also constructed do dissipate the heat to the board, but I did not do any research in that matter.
In my opinion the regulator heatsink is much more important than chip heatsinks.

+1, the most important task before serious overvolting of the h-boards (0.8V+) is to first stick heatsinks on the back side of the board under the regulator. If possible, stick a heatsink on top of the regulator and the inductor. This way you can take them as high as 1V. The board will dissipate close to 70Watts at 1V.

Can you recommend a source for suitable heatsinks?

maybe you like this heatsink but some said it's too tall http://www.ebay.com/itm/100x140x12-7mm-Aluminum-Heatsink-for-Electronic-Computer-Electric-equipment-H157-/181110341808?ssPageName=ADME:L:OC:CA:3160

i would beleive that you cant fill every slot on the board if using a heatsink taller than 8-10mm. i have some 35x35x6mm heatsinks on mine that easily allow airflow between every slot

You can see someone sell 100x100x15mm for Hboard heatsink https://bitcointalk.org/index.php?topic=313594.0