Haha, sounds like you're being Cox-blocked! :D
It looks like your ISP blocks incoming port 80. Check it out for yourself: http://support.cox.com/sdccommon/asp/contentredirect.asp
EDIT: Sorry about the broken link. I tried to find a working link but Cox doesn't give a way to access the...
Don't use the WAN port of the 2nd router. Just plug a (crossover) cable from a regular Ethernet port from one router to the other. This way they will only "switch" between the 2 which sounds like what you want.
Not by any standard means, no. Currently EtherChannel and LACP only work with 2 physical links to the same switch. If you REALLY want to use trunking you could get a Cisco Catalyst 2950 (with up-to-date firmware.) They run from anywhere between $150 to $400 on eBay depending on the number of...
Nacho is right. The PCI bus can only handle ~130 Mbytes/sec. 1000Gbit/s is 125Mbytes/sec, but it would not hurt to have 2 links bonded for redundancy purposes.
I also agree with having aggregated/bonded uplinks (2x1Gbit) from the smaller switches to the core switch. I don't know what kind of...