... Mechy sells a nice SCSI multi-card reader that you could install (with a bit of front case cutting) to mach transferring files between your PC/MAC and the Amiga easy via SD/CF Card.
Nooooooooooooooh! Don't do a "front case cutting" job! Keep the nice A3000 intact!
It's better to use a Buddha-Flash IDE controller or Tandem + Rear Mount CF-IDE adapter like this: