I then decided to sort out Internet Explorer (being a multi-browser type of person). I was not expecting that there would be a plugin, but I thought a bookmarklet might be on offer, or failing that I could possibly create one based on the Connotea bookmarklet I already use.
ShareThis has a plugin for IE. But I don't like it. It looks like this...No options ready to go, and no option to customise. One assumes that a ShareThis account is required to make this useful. If anyone can give me a clue about this, please leave a comment.