Just had a thought and I'm wanting to see what you guys think. Has anyone tried building links to an unregistered domain, let the links get crawled / indexed and then proceed to buy the domain after some time? Would any over optimisation penalties be avoided as links were built before the domain even existed. Or would the same thing apply as per normal when building links to a domain? Would the domain be quicker to index by doing this, would it immediately be penalized upon registration, etc? All very interesting. Anyone try something like this before?