1.21 b08 on my RMA'd and replaced unit seems to be a lot more stable than 1.21 b03 was on the last unit -  no glaring lockups, everything works the way I want it to, and though there are a lot of errors on wireless, nothing is screaming bloody murder at me, especially my DROID, so all is good.
Statistics:  (Stats that are boldfaced and italicized are changes from the values that I posted yesterday - as in significant increases for the 20 hour time period that it has been on)
General
Time : Thursday, December 31, 2009 12:17:17 PM
Firmware Version : 1.21NA,  2009/11/23
WAN
Connection Type : DHCP Client
QoS Engine : Active
Cable Status : Connected
DNS Status : Online
Network Status : Established
Connection Up Time : 0 Day 19 Hour 21 Min 36 Sec  (this is known - I rebooted the router manually yesterday after adding a new trusted MAC to the DHCP reservation list as well as the MAC filtering list)
LAN Statistics
Sent : 3436799 
TX Packets Dropped : 11
Collisions : 0
Received : 1938093 
RX Packets Dropped : 0
Errors : 0
 
WAN Statistics
Sent : 2077216 
TX Packets Dropped : 0
Collisions : 0
Received : 6451939 
RX Packets Dropped : 0
Errors : 0
 
Wireless Statistics
Sent : 472676 
TX Packets Dropped : 4184
Received : 244694 
RX Packets Dropped : 364
Errors : 1122