Hi!
for your first problem i would suggest you simply use the notation:
\\IP.OF.YOUR.WL700GE\MYSHARE1
if you have your standard share named MYSHARE1
For Mac you have a lot of options.
If you want to keep a vanilla wl700ge with the original firmware, enable nfs on your the wl770g and make an automount. You can do this manualy using netinfo manager, or you can try sharepoints automounter.
The Solution, that works best for me is kfurge's modified firmware and installing netatalk, cups and avahi. This way you can use afp shares, print using cups and see your box using bonjour. by the way replacing the buildin mt-daapd with a new version can give you playlist, static and dynamic.
cu
harald