N95 connected by usb to a Mac osx Tiger...

Either put it in Mass Storage Mode (Data mode) and the memory card will show up as a USB drive.

Or - install the Nokia Multimedia Transfer program:

http://europe.nokia.com/A4423134

Set the phone in "PC Suite Mode" and you can use this program to browse and transfer files.

It also lets you import and export photos to and from iPhoto and sync with iTunes.