Any status on this? 
OK FurryNutz and any others who might be awaiting the result of my attempt at a multiple-access point network --- here it is!!
(Sorry for the delay - too many holiday activities)I have successfully connected 3 DAP 1522 devices as wireless access points to my network. I found a simple article in the smallnetbuilder.com forum and went from there:
http://www.smallnetbuilder.com/wireless/wireless-basics/30355-how-to-add-an-access-point-to-a-wireless-routerAnother link to useful articles:
http://www.smallnetbuilder.com/wireless/wireless-basics?start=10Adding multiple wireless access points is a better solution than adding a repeater or range extender -- the throughput will be better (see above article).
As you suggested, I configured the network addresses manually. The default IP address for a DAP1522 is 192.168.0.50. For the second AP, I used the manual configuration procedure to set the IP address to 192.168.0.49. For the 3rd AP, the address is ...48. Note that these addresses are outside of the allowed range for the IP addresses configured by the router's DHCP [corrected] (for my DLink 655 router, that IP address range is 192.168.0.100 through ... 199).
If the APs are close enough to have substantial signal overlap, you need to change the wireless channel to one that is 5 channels apart from others. As you suggested, I used channels 1,6 and 11 for my 3 access points.
Each access point is set up with a separate SSID. The reason for this is explained in the article. The short version is that the 802.11N wireless protocols don't specify a good way for the network to hand off connections from one AP to another as you move about. Once a wireless device connects to an AP, that link tends to be "sticky" - the link won't release from a weak signal to join a stronger signal. All said, it's just easier to set up each AP with a separate SSID and manually connect to the strongest signal, depending on where you are located with a particular wireless device.
Each AP is connected to the router by Ethernet cable. Everything works great. There is good signal throughout the entire house now, and each connected device can "see" the other devices even though they might be connected to different access points.
So, what do you think? (And thanks for the advice).