This is what I use..its awesome..and free!
http://www.faststone.org/FSResizerDetail.htm
FastStone Photo Resizer is an image converter / resizer intended to enable users to convert, rename, resize, crop, rotate, change color depth, add text and watermarks to images in a quick and easy batch mode. Drag and Drop mouse operation is well supported.
Features
Convert and Rename images in batch mode
Convert to JPEG(CMYK, RGB, YCbCr), TIFF(CMYK, RGB, YCbCr), BMP, PNG, GIF
Resize, crop, change color depth, apply color effects, add text and watermark.
Rename images with sequential number.
Support folder/non-folder structure.
Load and save settings
Mouse Wheel Support
Can't go wrong with this one!