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iptables and forwarding port 80

Hello.  I'm having trouble opening up port 80 on my firewall and I'm not
sure if it is because nmap shows it closed, or if I have a broken rule.

My rules for masquerading/redirect are as follows:

#pick up ip from dhcp
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

#protect forward rule
iptables -A FORWARD -i eth0 -m state --state NEW, INVALID -j DROP

#forward port 80
iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j DNAT --to\

#open port 80
iptables -A INPUT -i eth0 -s 0/0 -d 0/0 -p tcp --dport 80 -j ACCEPT

Output of iptables -L:
ACCEPT 	tcp	--	anywhere	anywhere	tcp dpt:www

I can surf the internet on this network, but connections to port 80 are denied.

Can anyone see any obvious oversights here?

Thanks for any help.

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