Right on cue, Slashdot reports that "Google Sends Legal Threats to Media Organizations" over the use of its name as a verb for internet searces. See here.
To be more specific, potentially they could lose their trademark (at least in the US) if it becomes an ordinary word ("google" isn't an English word yet, although "googol" is), as once a word has become a generic term, it becomes impossible to enforce trademark rights on it.