How can I get in contact with the liquidator? Is there a formal way for making fund claims in that process?
Yes there's a formal process. The liquidator isn't the liquidator until either a special resolution is signed by the partners or the company is out into liquidation by the NZ High Court. Once that happens, the liquidator will contact all listed creditors and also publish a notice regarding the liquidation. The claim form is very simple and some liquidators allow it to be lodged online. You generally have about 4 weeks to lodge your claim after that happens but the claims aren't formally verified until just before the liquidator is ready to make a distribution. You'll receive periodic reports from the liquidator between the time when the company first goes into liquidation and the liquidation being finalised.
I have no doubt that once the liquidator is appointed, Tihan will make a post here advising people that the liquidation process is formally under way and giving the appropriate contact deals. There is no point in contacting the liquidator prior to that as he will have no legal authority to deal with matters relating to Bitcoinica until formally appointed.