I've configured a 5-site system, with PIX501's at head office + 3 sites, and a ASA5505 at the 5th site. All is working as I want it to with the PIX-to-PIX tunnels but I have 2 issues with the ASA-to-PIX tunnel:
1) At the ASA site, in Entire Network, only the PCs at the local site show up, not the ones elsewhere in the WAN. I can access them by either IP address or computer name, but they don't show up as 'blue' computer screens when you double-click into the domain icon in Entire Network.
2) I can see shared drives & printers at head office from the ASA site but not vice versa. In fact, all I can do from head office is ping the devices at the ASA site; I can't see them nor browse for them by computer name.
Dunno if the 2 issues are related or not.