Useful links:

If you are contemplating to start a new business, this is one site you would want to visit
http://www.business.govt.nz/compliance/business-structures

If you are already running a small or home business, this might be useful
http://www.homebizbuzz.co.nz/

Want to know more about your business taxes?
http://www.ird.govt.nz/business-income-tax/

Create more visibility for your business by listing in these sites
http://www.nzsbdirectory.co.nz
http://www.yellowpagesgroup.co.nz
http://www.hotfrog.co.nz
http://www.gopher.co.nz
The New Zealand Website, Article & Business Directory