PDAs have excellent sideloading options. USB and Bluetooth file transfer may both be supported and if the PDA has removable memory cards it is possible to write to them and insert them into the PDA.

Bluetooth

The built-in support for Bluetooth in newer Macs is excellent for transferring video into PDAs. If you have this option you can be viewing videos on your PDA within minutes.
Final Step -  Bluetooth Pairing and File Transfer

USB

Having a USB option will depend on whether you have software that can sync with your PDA or whether your PDA mounts as a storage drive on your desktop.

Memory Cards

Removable memory cards come in a variety of formats and sizes and are not supported on all PDAs. However if your PDA supports removable memory cards and you have a card reader, then this is a great sideload option

Memory cards have huge capacity for video storage and data transfer speeds are very high.

Final Step -  File Transfer Using Memory Cards