There's no way to read Amiga floppies directly...
You could get a Kryoflux, which is a USB device that you can connect a PC floppy drive to and then create images.
I have one and it's great for archiving, etc..
Not sure it's the best choice for the casual fan, but you can take a look.
If you have disks that aren't in the SPS (Software Preservation Society) IPF archive, a Kryoflux would be nice so you can create full images to send it to be archived...
It does have Mac software..
The other option would be serial, but I'm not aware of any Mac software to use for that, and copy protected disks can be an issue...