Bye Bye Sub Domain from the SERPS - Hello Site Links
Matt Cutts of Google at Pubcon reported today that Google will soon be treating sub domains similarly to the way they currently treat folders, according to Search Engine Land.
There will only be two URLs from any domain in the search engine results page. So, if you have multiple sub domains on your site, only two will show up in the search engine results page - no matter what.
If you search Google, for example, you can see that the top 10 results are all Google sub domains for products.

So, how will Google and other site owners still be able to show their sub domains?! I mean, they are very important to Google and the site owners, and Google would not just say “Awww, too bad you only get two URLs in the search engine results page.”. So, what is Google going to do?
I think Google will be granting sites with multiple sub domain and folders site links in the search engine results page. They are already doing this, but I think the site links will become a common sight in the search engine results page. Good old Barry over at Search Engine Roundtable thinks this as well.
Site links are the URLs that are placed directly underneath your main domain listing in the search engine results page, and site owners can control what is displayed through their Google Webmaster Account.
When you search “Search Engine Roundtable” in Google you see:

With this in mind, Google should be getting site links under their main domain. It might look something like this:

So, site owners, I think you need to get ready for a site link invasion. Make sure to verify your site with your Google Webmaster Account, so you can control what site links are displayed.
Only time will tell if am correct, but I have a good feeling about this one!
UPDATE:
Looks like I was correct. At 12:31:00 PM Google officially announced the following:
We’ve also been tweaking things here and there so that Sitelinks will appear for many more websites, and with more descriptive names. These improvements should help get you to the specific page you’re looking for even more quickly.
Here at eVisibility we pride ourselves on being ahead of the curve.
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December 7th, 2007 at 3:46 pm
This is a great concept, the idea that Google is going to start using Site Links more and is doing away with spammy sub domains is a great move in the right direction.
December 7th, 2007 at 4:29 pm
Google to devalue subdomains…
Now this is really interesting - Google results filled with sitelinks?
http://blog.evisibility.com/bye-bye-sub-domain-from-the-serps-hello-site-links/……
December 8th, 2007 at 9:34 am
Regarding subdomains, some clarification:
“This isn’t a correct characterization of what Google is looking at doing. What I was trying to say is that in some circumstances, Google may move closer to treating subdomains as we do with subdirectories. I’ll talk about this more at some point after I get back from PubCon.”
- Matt Cutts, http://sphinn.com/story/17696#c21126
Another attendee at PubCon talked to Matt and got some clarification:
“Matt said that Google will make it HARDER to get that 3rd result in a given search, and then increasingly harder for every result after that.”
- Ted Ulle (tedster) http://sphinn.com/story/17696#c21173