About 2 months ago we launched a couple of new sites on subdomains. We have a very established main domain, and we linked to both subdomains from the main navigation on the main domain. One of these subdomains was a blog - we did some PR for it, and a campaign on Twitter, and the blog ended up being indexed very quickly.
However, 8 weeks on, and the other subdomain still hasn't been indexed. I've audited it for technical issues - it has no robots.txt, no robots meta tags, and always returns correct HTTP codes. It has links from our own group of sites, but very few from elsewhere. I've created a GWT account, which suggests there is very little wrong with it. I've also submitted for Google for reconsideration, who have given me the usual spiel about checking their guidelines etc...
So in summary, I've 99% sure there is nothing technically wrong with this website. Anyone else seeing any similar behaviour from Google at the moment?