Based on Shodan there are at least 87,494,410 web servers [1] on port 80 now. For port 443 there are currently 14,918,407 servers listed [2], and for port 8080 there are 7,570,586 [3].

[1]: http://www.shodanhq.com/search?q=port%3A80

[2]: http://www.shodanhq.com/search?q=port%3A443

[3]:http://www.shodanhq.com/search?q=port%3A8080