where a site is getting its traffic from?
 

What's the best way to tell where the majority of a sites traffic is coming from? Alexa?

if alexa says for example... clickstream - google.com - 40%

would that most likely mean they are using google adwords

start here
http://siteexplorer.search.yahoo.com/

if you think they use adwords
http://www.keywordspy.com/

more about your competition
http://www.linkdiagnosis.com/

better than alexa
http://siteanalytics.compete.com/

google analytics is your friend

Good stuff :thumbsup

thanks :thumbsup

3-5% of your traffic are mobile users. ; )