I always wondered but, alexa give you graphs and 'ranks' but no estimation on the number of users they get, does anyone know? I was kinda assuming that possibly 1million+ a day.
My site has just gone below 100,000 in the last few days and I'm about 3000 unique visitors and 40,000 pageviews a month. http://metrotags.info
My site is ranked around 39,000 worldwide and 13,000 in the USA - it gets 10,000-15,000 unique visitors per day.. another way to check traffic is to look at Google Trends: http://trends.google.com/websites?q=sitename.com&geo=all&date=all&sort=0