You can create an Action in PS and then create a Droplet.
Drop a folder onto the Droplet and it will perform the Action on the entire folder.
I created an Action to change a photo to B&W.
Then create a Droplet and save it to the Desktop as an Icon.
Take a folder and drop it onto the Droplet Icon and the entire folder is B&W and saved to a new folder.
You can do the same thing for your purpose.
Let me know if you are interested, I'm at work now and don't have time to get into details.
There are many was to achieve what you want, droplets can save time.
Creating a Droplet makes an Icon on the desktop. Even if PS is closed, by dropping a folder of photos on the Droplet, PS will open and perform the Action.
This is in PS CS2.
Create an Action to resize your image and any other steps you want to take. Tip: Click - Image > Image Size > Instead of using 800 pixels use a percentage and it will work on both landscape and protrait.
Click on the Action Group and Save in a location like Documents
To save an Action, select the Group and click the fly out arrow to the right, choose Save Actions
Now for the Fun part
We are going to create an Icon on the desktop to convert an entire folder of Photos automatically. This is called a Droplet
File > Automate > Create Droplet
Choose > name the droplet > Where = Desktop > Save
Play > select your Set and Action
Check > Suppress File Open Options Dialogs
Check > Suppress Color Profile Warnings
For now choose Destination > None
On the Desktop select a folder of photos to covert
Drop it on the Droplet icon.
You may need to click the icon first or hold the folder over the icon a few seconds and then drop it.
If Photoshop is closed the Droplet will open it.
If you've gotten everything to work so far, let's take it one more step.
Add a step to your Action to save to a new folder, just add Save AS to the end of the Action.
Create a new Droplet and this time select the new folder as the destination.
Check > Override Action Save AS Commands
Save As must be a part of the Action for this to work.
This is advanced PS. Let me know if it works or if you have trouble.
Wonderful breakdown Greg! I was always curious about these droplets but never did anything with it. The only thing I wish they would have added to the automation would be to shut down photoshop when it was done (or at least minimize it during the operation)... Thx again though - worked like a charm!