Windows XP has a Power Toy called Image Resizer that I always found very handy to quickly resize my images before sending them to someone/somewhere. With the Power Toy I could just right click on the image and select a desired image size. I just found a similar utility for OS X, it is called iResize from smallApps by dani.
iResize let's you quickly resize your image to any desired size, it also quickly converts your image to any of 11 different formats (bmp, jpg, png, tif. ...). Run iResize, drag a pictures or a directory of pictures, select a desired file dimension, and you are done.
I wish that iResize supported drag-and-drog without having to first run the application, or that i added some commonly used sized to my images context menu, but all in all, it is a great utility that saves me from having to run Photoshop just to resize an image.
Batch resize and compress images, known types are:
.jpeg, .pict, .tiff,.gif, .psd and QuickTime images
• resize one image or all images in a list
• resize by fixed height or fixed width
• preferences window for some settings
• very fast and easy
• It's possible to add an extra text (ex: -r,small,...) to the resized images file names
• Alert for file names longer than 31 characters
• Function to fix JPEG files with incorrect information (MacType & MacCreator ID)
• Rewritten from scratch and compiled with the latest version
• Added italian localization
• Added capability to drag & drop files and folders to the batch list