Recently I needed to watermark hundreds of image files but found that batch processing them using my version of Adobe PhotoShop was rather complex.... After a lot of searching on the Internet I discovered FastStone Image Viewer, which I can highly recommend. It also does lots of other useful things - e.g. it can resize images in batches, and amazingly it is entirely free (but donations are welcome)! There is a useful tutorial here http://www.youtube.com/watch?v=fYiBMSEt_W0 which also explains where to download the programme from.
A while ago I recommended a programme called Advanced Word Find & Replace, which can search and replace text and formatting in large batches of MS Word documents. The version I originally bought could not find formatting codes such as paragraph marks, but the latest version (4.5) can, which is extremely handy. See http://www.technocomsolutions.com/advancefindreplacehelp.htm