Resizing pictures is what most people do. Few of us edit pictures: crop them, adjust brightness or contrast, remove red eyes, apply filters or effects and save them in other formats.
If you need any of those features there is a rich collection of software tools you may choose from. Some of them are even free!
JustResizeIt! resizes pictures.
JustResizeIt! comes in two versions:
The "+" version has a fast resizing engine and preserves EXIF information. The "+" version provides additional useful features after the resizing is done: organize your collections, share with friends, manage your own gallery online and many more.
The free version is meant for occasional usage where the sending can be done manually. The free version does not have additional features.