WebImageGrab

WIG is a 3D Web image browser powered by the image search module of Google. It's simple: type in a keyword and WIG will start downloading images for you. WIG is available for Mac OS X and Windows/PC. No installation is required, simply download, unzip, and run WIG. It will create a cache on your hard drive where you can easily scan the results. You can automatically translate your search phrase into other languages to find even more images. This makes image research much easier and a lot more fun. Other features : you can start a batch search to process multiple searches. There is a WIG PRO version that has all features unlocked.

Limitations:

30-image trial