Shrink Pic resizes photo on-the-fly for email, Instant Messenger and web uploads. It runs in the background and detects when large photos are sent. Then, it automatically creates a resized copy and sends it instead.
Photos that Shrink Pic creates look just as good, but reduce in size from Megabytes to 50-150Kbyte.
When you send photos with Shrink Pic, you can attach dozens of photos to your email, and send them in seconds.