You don't say what your field is and whether your job description is on the absolute or long term skills shortage list at all.
We got picked out of the pool on 1 July after being in there for 6 months simply because NZIS moved my OHs skill from the long term skills shortage list to the absolute skills shortage list. We only had 120 points.
If your job description is on either of these lists I would suggest you get your EOI in asap as historically NZIS look at those with lower points in the back half of the year.
EOI submitted 11.1.10
EOI selected 1.7.10
ITA received 14.7.10
ITA submitted 21.10.10
Medical given all clear 16.3.11
Telephone interview 25.3.11
Residence granted 26.4.11