Based on the other post, it looks like he had this made by Futurelec, so options for things like masking the vias is pretty limited if not non-existant.
Futurelec is a non-option for me, since their minimum 10mil trace/space rule means every chip with a popular 0.5mm lead spacing is unworkable.
It also seems pretty expensive. I just priced a single DS 10cm x 10cm board and was quoted $71 USD. 10 would be $161 USD. For $100.00 USD you can get 1000 square cm of DS with solder mask and silkscreen at Gold Phoenix and 7mil trace/spacing, shipped.