There is no adwords impression of my site since this morning. Yesterday the statistics was not updated, but still there was impression. Today it seems all down, at least for me. Tried different keywords, nothing shows up for my site. What's going on? Google customer service takes 24 hours to respond. This time of the year is very important to most of us. If Goggle goes down, we are in big trouble.
Google might be the biggest keyword referrer right now, but (a) if you add up the others you still get a lot of visitors and (b) SEM should not be the only marketing you do or the only way you get traffic. You should also have a loyal visiter base (that bookmarks and come back), have members of newsletters that you use to promote the site, use your URL's in ofline marketing etc. Don't rely on search engines only for your business :)