blueshift said:No need to use any other s/w or plugin.
In Photoshop, just create an Action and apply batch processing to all images. Heres how you do!
Open any image in Photoshop that you want to resize. Then from the Actions pallete, click on Create new action. This will start recording an action. Now goto Image>Image Size.. , enter appropriate values and press ok. Then press stop recording. (Theres no need to export or save that file)
Now goto File>Automate>Batch.... From their, choose Action that you just created, source and destination folders. And press Ok.
This will resize all the images in just one size, the values that you entered when creating an Action. If you want to set individual values, just toggle the dialog options from the Actions pallete corresponding to your Action. You can read PS Help files for this.