>>> The last thing I did, which seems to have
>>> "broken" everything (including me) was in my
>>> Belkin router setup under my IP address
>>> 192.168.2.1 (My linksys IP address is 192.168.2.1)
These two devices should not have the same IP address; every device in a network must have a unique IP address. A Belkin router's IP address would normally be 192.168.2.1 and, if the Linksys box gets its address by DHCP from the Belkin, it will have a 192.168.2.x address, where 'x' is between 2 and 254. If the Linksys is a "Cable/DSL Router", its own LAN IP address would normally be 192.168.1.1
You said that you set the Belkin to "Use as Access Point". I don't know what the alternative setting was but suspect that is what you should be using, "router" perhaps?
With ADSL in the UK, PPPoA protocol and not PPPoE is normally used, although AOL may use PPPoE.
When you selected WAN and Clone, the router has probably cloned the MAC address of the PC's network adapter. This feature is used when a network adapter has to be registered with an ISP in order to connect. By cloning the address, the ISP is unaware that a router is connecting instead of the original adapter. It is unlikely to make any difference in your case.