Well, I have finally got round to looking at Delicious. I am not a 'social network' user, having never quite seen the point of being 'friends' with people I do not know.
However Delicious seems to be another thing all together and a useful way of tracking pages and sorting information. Much more useful, provided I use intelligent tags and use them consistently, than the Favourites option in Explorer.
I will need to play with it some more another time.
Vikki