As I reported yesterday at Search Engine Land, the site command may be a bit buggy for you right now and may not be resolved for about a week.
In short, some SEOs and webmasters began noticing that conducting a site command in Google for large sites would only return 30 results. I personally have not been able to replicate it but I’ve been getting random complaints about this on Twitter. Justin Briggs has a screen shot showing this in actions, where a site command for amazon.com only returns 30 results.
Google’s Matt Cutts told us at Search Engine Land:
The domain clustering change was something Matt announced last week in his ten SEO changes coming to Google.
So don’t panic, your site is probably still indexed by Google.