Which niche? The demand for quality devs will always be high imo just due to the wide spread use of computers in businesses everywhere.
Ditto - what niche? I'm out of work and could use a few tips.
I'm assuming from the guy's profile he works on ATG (ecommerce for Java)
ATG (www.atg.com). It's very expensive eCommerce software, J2EE based, with their own IOC container, data access layer, etc... At the moment the demand for good ATG devs and architects far exceeds the supply.