Here are some links to useful software sites. A lot of this software is free.
Image Resizing Tools
Image Resizer for Windows is a free utility that lets you resize one or more selected image files directly from Windows Explorer by right-clicking.
Image Resizer for Windows XP
Originally a PowerToy for Windows XP you can now grab it for Windows 7 via Codeplex.
Image Resizer for Windows 7
Another Image Resizer for Vista/Windows 7
iResize 3.2.3 for Mac
Batch Image Resizer for Mac
Image Resizer for Mac OS X
Panorama Stitching Sotfware
If you are interested in makeing panoramas that are stitched together from a series of photos you will most likely require some stitching software.
Panorama Factory which I find very good.
Review of a variety of Panorama software for both Window and Mac
PanoramaPlus Starter Edition
An application and tutorial on shooting start trails.
StarStaX is a fast multi-platform image stacking and blending software, which is developed primarily for Star Trail Photography. Besides star trails, it can be of great use in other settings. StarStaX allows to merge a series of photos into a single image, where the relative motion of the stars creates structures looking like star trails.
If you need a manual for your camera you may find it here.