I have now had the pleasure of owning a DIR-625, a DGL-4500, and now a DIR-655.
On the 625 and the 4500, the logs are straightforward and make sense.
I cannot make heads or tails out of the logs that the 655 shows me.
*** Are you all getting the same kind of information as I am getting in my 655 logs below ? ***
**** DIR-655 *****
Dec 17 11:00:40 dir-655 local0.info udhcpd[26635]: UDHCPD Inform: add_lease 192.168.0.66
Dec 17 10:57:02 dir-655 user.info kernel: [228354.270000] m_table count= 4 Add 01005e7f fffa000a
Dec 17 10:57:00 dir-655 user.info kernel: [228352.670000] m_table count= 4 Del 01005e7f fffa000b
Dec 17 10:54:06 dir-655 user.info kernel: [228178.540000] m_table count= 4 Add 01005e00 00fc000a
Dec 17 10:50:47 dir-655 user.info kernel: [227979.670000] m_table count= 4 Del 01005e00 00fc000b
Dec 17 10:45:06 dir-655 user.info kernel: [227638.080000] m_table count= 4 Add 01005e7f fffa000a
Dec 17 10:44:32 dir-655 user.info kernel: [227604.670000] m_table count= 4 Del 01005e7f fffa000b
Dec 17 10:44:29 dir-655 local0.debug udhcpd[26635]: UDHCPD sending ACK to 192.168.0.55
Dec 17 10:43:43 dir-655 user.info kernel: [227555.120000] m_table count= 4 Add 01005e00 00fc000a
Dec 17 10:43:02 dir-655 local0.debug udhcpd[26635]: UDHCPD sending ACK to 192.168.0.66
Dec 17 10:41:46 dir-655 local0.info udhcpd[26635]: UDHCPD Inform: add_lease 192.168.0.65
Dec 17 10:38:15 dir-655 user.info kernel: [227227.670000] m_table count= 4 Del 01005e00 00fc000b
Dec 17 10:16:35 dir-655 user.info kernel: [225927.310000] m_table count= 4 Add 01005e00 00fc000a
Dec 17 10:15:20 dir-655 user.info kernel: [225852.670000] m_table count= 4 Del 01005e00 00fc000b
Dec 17 10:15:10 dir-655 user.info kernel: [225841.890000] m_table count= 4 Add 01005e7f fffa000a
Dec 17 08:52:01 dir-655 user.info kernel: [220853.670000] m_table count= 4 Del 01005e00 00fc000b
Dec 17 08:47:12 dir-655 local0.info udhcpd[26635]: UDHCPD Inform: add_lease 192.168.0.65
Dec 17 08:45:54 dir-655 local0.debug udhcpd[26635]: UDHCPD sending ACK to 192.168.0.65
COMPARED TO (for example)
*** DIR-625 ***
[INFO] Sat Dec 11 23:53:10 2010 Blocked incoming UDP packet from 183.82.19.198:12318 to 99.239.222.234:16995
[INFO] Sat Dec 11 23:50:36 2010 Blocked incoming ICMP packet (ICMP type

from 216.19.178.194 to 99.239.222.234
[INFO] Sat Dec 11 23:48:42 2010 Log viewed by IP address 192.168.0.65
[INFO] Sat Dec 11 23:48:18 2010 iceman: Wireless system with MAC address 00215C2A480D secured and linked
[INFO] Sat Dec 11 23:48:18 2010 iceman: Wireless system with MAC address 00215C2A480D associated
[INFO] Sat Dec 11 23:47:37 2010 Above message repeated 1 times
[INFO] Sat Dec 11 23:47:37 2010 Time synchronized
[INFO] Sat Dec 11 15:48:56 2010 Time server ntp1.dlink.com is at IP address 61.67.210.241
[INFO] Sat Dec 11 15:48:52 2010 WAN interface speed measurement completed. Upstream speed is 1056 kbps
[INFO] Sat Dec 11 15:48:35 2010 Wireless link is up
[INFO] Sat Dec 11 15:48:18 2010 Starting DHCP server
[INFO] Sat Dec 11 15:48:17 2010 Estimating speed of WAN interface
[INFO] Sat Dec 11 15:48:16 2010 Obtained IP Address using DHCP. IP address is 99.239.222.234
[INFO] Sat Dec 11 15:48:15 2010 Bringing up WAN using DHCP
[INFO] Sat Dec 11 15:48:15 2010 WAN interface cable has been connected
[INFO] Sat Dec 11 15:48:15 2010 LAN interface is up
[INFO] Sat Dec 11 15:48:15 2010 LAN Ethernet Carrier Detected
[INFO] Sat Dec 11 15:48:15 2010 Device initialized