I too found that I got a load of disks on the desktop, and they just kept coming. (Cacko Qtopia ROM)
Sometime ago I had Sambaserver working on a 5500, and that mounted perfectly through a wireless connection.
Also, on the mac side, enabling the FTP server in the OSX network preferences gets me a really nice fast access to the whole OSX filesystem via OpieFTP wirelessly.
I haven\'t tried NFS yet.