A word of warning to people new to re-sizing images: Create a new folder and save them in that, separate to the original file otherwise you run the risk of making your picture files to small to print from!  Unless for picture storing host can do that without compromising the originals.

Good call on 72dpi - it's fine for viewing on screen.  You only need the usual 300dpi if you want to make prints.

While we're on the general subject, Malcolm - can you let me know if it's acceptable for me to watermark my images with my website address?  It's opaque at approx 45%.  I do that to try and protect myself from theft.  Even so, I found some of my shots on a Czech website the other day and the guy that pinched them had even put his own copyright mark on them!