Slightly off-topic but addresses your comment about the tediousness of reducing photos for posting.
This is a drop-dead-easy way of resizing, including doing in bulk with a single commandline command, no fancy or expensive Photoshop program needed:
Firstly, download the free/open source ImageMagick program from
http://www.imagemagick.org
and install. There are builds for Windows, Mac, Linux etc.
Once installed, open up a command prompt and go to your fullsize photos directory. (Best to practise on some test photos first)
Assuming you had a bunch of JPEG images you want to make a quarter the size of the originals, type the following:
convert -resize 25% *.jpg resized%03d.jpg
You should have a bunch of pics named
resized000.jpg,
resized001.jpg and so on. The %03 means substitute a padded 3-digit number for each image (This is an easy way to make thumbnails from originals.)
There are about fifty-seven million things you can do with this wonderful program - it's like a 100-bladed Swiss army knife for image manipulation, just take a look at the examples on the ImageMagick site.
Steve.