Step 1: Configure Your Podcatcher
sudo apt-get install miro
Once in Miro, go to Video > Options and click the Folders tab. Under "Store downloaded videos in this folder:" create a new folder to hold all of your podcasts. I chose /home/user/Podcasts. All of my podcasts are stored in subfolders beneath this directory. I find it's helpful to keep these segregated from your music collection to simplify the sync process. Once you're out of the options screen you can add podcasts to Miro by using ctrl+n and pasting the URL to your podcast of choice.
Step 2: Configure Your Blackberry
Under Mass Storage Mode Support, select On.
Under Auto Enable Mass Storage Mode When Connected, select Yes.
Hit the Back button, choose to save the changes you made, then plug the phone into your computer.
This concludes the configuration of the Blackberry, in the next step we'll configure the computer.
Step 3: Configure Computer
Step 4: Configure Cron to Sync Your Files.
Copy and paste the line below to your crontab. Change the paths to match your configuration.
*/5 * * * * rsync -r --del /home/user/Podcasts /media/8GBMEDIACAR/Music
Configured this way, cron will run Rsync every 5 minutes and copy any new files from your /home/user/Podcasts directory to your Blackberry, or delete any files that you have deleted from within your podcatcher. You can create a shortcut on your desktop to force a sync if you don't want to wait for the next run of the script <edit> in fact, as I've discovered, manually syncing may be the best way to go since you may disconnect your Storm halfway through a transfer. Here is the command that I use for the manual sync:
rsync -r -v --del /home/user/Podcasts /media/8GBMEDIACAR/Music
The -v switch will make rsync operate in verbose mode so that you know what it's doing and aren't staring at a terminal window with a blinking block in the upper left. </edit>
...And that's it! You can use this method for any device which is recognized by your computer as a mass storage device, or even if you have a directory that you want to keep backed up to an external drive. Hopefully this is useful to someone, thanks for checking out this instructable!