kingchops said:

The Powerbook 180 has a 1.44 "SuperDrive" floppy.  These floppy drives can read disks form more modern pc's or Macs.  Simply download stuff to a more modern machine and transfer to the Powerbook via floppy.  If you don't have a floppy on the more modern machine, you can buy a usb floppy drive for very little money.  The Powerbook floppy can also read/write 800k disks for the Mac Plus.

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To add to this, the 180 will the be easiest way to transfer material to the Plus, since the Plus can only read 800K floppies.  I was in the exact same boat a few years ago and ended up buying a Powerbook 3400 as the "bridge" machine:

Intel Mac Mini w/ USB Floppy ---1.4MB disk---> Powerbook 3400 [180 in your case] ---800K disk---> Mac Plus

I am not sure how I can get old software/games that will run on either machine.

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Other alteratives are to pick up an Asatne EN/SC adapter to give you Ethernet or SCSI, and then run an FTP server off ofyour main machine.  However, you will still have a chicken-and-egg problem if you don't already have an FTP app on your classic hardware.