Long Version:
 
Story goes like this. Got the GL in and right off the bat used the GUI to
attempt a firmware update to DD-WRT v23. For what ever reason it errored
the first time so I went back and tried again. This time the router said it
upgraded but never rebooted. I waited like 10 minutes then pulled the plug.
Upon coming back up I only got the flashing power and nothing else. No
pings, http or anything. So off with the case and a quick short of pins
15/16 during a pwr on gave my ping back. I tried using the standard windows
XP TFTP client to load an old version of the linksys FW because the 4.30 has
not been release in compiled format but that failed every time with a can't
do because FW to old message. So thinking something else is up I decided to
download linksys's tftp client program
ftp://ftp.linksys.com/pub/network/tftp.exe and try again. This time I used
linksys's old firmware 4.20.7. This appeared to fail to begin with but when
I reset the device low and behold I have the old firmware. From their I
tried to install the dd-wrt v24 mini or the generic both of which failed
with a lame "upgrade can failed!" or some such crap. So I used the linksys
tftp tool to load the mini which to my suprise worked. From their I used
the GUI to update to the dd-wrt v24 generic which worked. BTW I tried using
the dd-wrt v24g which failed everytime ending up in a non responding
blinking power light.
 
Short Version:
 
Download the linksys tftp tool ftp://ftp.linksys.com/pub/network/tftp.exe
Download both the dd-wrt v24 mini and the v24 generic
TFTP the mini first then load the generic using the GUI.