I can go into My Network Places on either machine and click "Add network place", type in the respective IP address for the other computer in the field(e.g., for my laptop, \\198.162.0.100), and then it will list the shared resources. Select the one you want and click enter. I just have to do this once for every resource that I want to access, from both accounts on both computers (pain in the arse). But at least its working.
Seems that part of my problem was that I had Windows configuring my wireless connections, and Windows is, as in all other aspects, pretty stupid about that. It wasn't always connecting me to my "Preferred" access point, but was occasionally connecting me to a neighbor's (meaning that his isn't secured at all, because I was accessing the internet consistently)! So I switched over to the D-Link utility for connections. It only connects me to my preferred AP. Still there was nothing in My Network Places or in my workgroup, but I could now ping each computer from the other. So, using that information, I could now manually add network places using the IP\[folder name]. I then restricted the DHCP as mentioned, so that the manually added folders wouldn't become inaccessible if the router were to switch the IPs for the two computers.
Make sense? God it took me a long time to figure this out...