I reported this morning that Google has changed the way they handle navigational like searches. For example, if you do a search on a site's name (i.e. navigational) you now get a different type of result set then you did a week or so ago.
For example, a search on the popular buy.com will now show:
Show Google's cache of www.buy.com
Find web pages that are similar to www.buy.com
Find web pages that link to www.buy.com
Find web pages from the site www.buy.com
Find web pages that contain the term "www.buy.com"
Instead it will show you results that match the keyword phrase "buy.com." That includes links to possible competitors. I wonder if that will upset geico.com?
In any event, I have compared how Google, Yahoo, MSN and Ask.com handle these types of navigational queries at the Search Engine Roundtable.