Irfanview if you want something free, it has a batch resizer built in Point it at the source folder and the destination folder and away you go
I use the nice little program over here: http://www.jklnsoft.com/ It converts them and also allows you to put a stamp on them to stop people knicking them or hotlinking them. Its not free, but is very user friendly, simple, easy and quick to use and well gets the job done. There is a trial version you can have a play with
http://www.microsoft.com/windowsxp/downloads/powertoys/xppowertoys.mspx from microsoft. Or... Photoshop, beware the photoshop resize action, does not seem to make a good job of compression.
I know it probably isnt relevant anymore but incase its picked up by someone searching in the future, I used IrfanView yesterday to resize a whole bunch of images and it worked a treat. So thanks for the tip Andrew.
