This is just a quickie to say that, if you're looking for a bulk image uploader tool for WordPress, you could be missing the wood in amongst all those trees.
Yes, there are plugins out there that can handle the process, and these are likely to prove essential if you need to import all the caption information etc that goes with each WordPress media library entry.
However, if all you're looking for is a batch image uploader for WordPress, you might need to look no further than your keyboard's shift or ctrl key.
When using the Flash-based image uploader - accessed via the normal 'add new' button in your WordPress installation's media library - hold down ctrl and click multiple files to select them.
Shift performs its usual function of allowing whole ranges of files to be selected without having to click on each separately.
If you click OK, WordPress should queue all of the files you selected and upload them all with their own file names and blank caption information.
OK, it's not a perfect solution, but if you have lots of images to get into your library, and the details can wait until later, it's a good starting point.