Here's a cool little freebie.
PicSmart:
Want to know how many images of each size are in your folder? Want to split them up into groups of 10, 15, or whatever you like? How about ranaming them as well? What if it could tell you what % of each size would be used? Now what if the price for this was free?
Calculates how many galleries you can build with images in a folder
How many verticle and horizontal images are there in a folder
Calculates the pic usage of each size of image
Copy or move the images to other folders based on settings
Rename images how you want
Check for updates click of a button
Plus more
http://wizardsoftware.biz/picsmart.html