Firsst, I think the ccTLD Google results are easier to game than google.com results.
In this case, I checked a few of those subdomains and they usually contain many pages rather than being the overly thin sites that were used previously to game the SERPs. I don't speak Spanish so I can't easily tell if that "fatter" content is auto-generated, however.
It's not that keyword sub-domains are a bad idea on their own. Rather Google only stomped on the abusers: wild card hostnames with thin content, especially those leveraging the QDF aspects of the algorithm. These current results seem to be taking a different tack and some definitely appear to be legitmitate.
9:53 am on Dec 21, 2010 (gmt 0)
wild card hostnames with thin content
I don't think google can know if a subdomain is wildcarded or manually dns configured
Anyway yes those results seem to be legitimate but still they are taking advantage of key in subdomain and since google now shows more results from 1 domain/subdomain those structure is always in top results =/