thanks, leon and coen. I did have a good time.
Having only given one "star party" I can see ways to improve the experience, although some of my comments are gleened from experiences tutoring at university.
1. as you say, Coen, keep the list of objects short and limit to interesting/exciting objects. People lose interest otherwise. I found that doubles and triples did not keep people's attention longer than to say "that star you can see with your naked eye is really two stars". I think it is cool, but...
2. have another telescope handy or pair of binoculars so that other people can have a look at something whilst waiting for a go at the main telescope. For binoculars, it is especially important to point the viewer to particular objects otherwise it is a waste of time.
3. before showing people the object through the telescope give them a quick 'naked eye' tour of the area you are going to look at. This gives a sense of place to the object. You do not need a laser pointer for this. My friend was especially intigued that there was nothing to see 'naked eye' where we were pointing the telescope but could easily see M50 and a lot of other stars through the telescope.
4. Study up on the objects.
That is, ensure you have an idea about the clusters/nebulae/galaxies you are looking at. You do not need to tell them all/any of these facts as it can get a little bit dull (it depends on the audience, i guess).
hobbyists can drone on a bit (even astronomers...

) and some peopel just want a little bit of information not the entire wikipedia entry.
For example (questions I was asked):
- what is the difference between an open cluster and a globular cluster, especially if you are going to look at both
- why are the stars you see in the object particular colours
- how far away is the object, how long did it take for light to reach us
- how old is the object
- what are the differences between telescope types
- know a few constellations and the brightest stars in them, and any interesting facts (e.g. doubles/triples, etc.) even if you will not show them the object
- some people are very technical or photographers like my friend and can ask technical questions, so a better understanding of focal lengths, magnifications, telescope 'speeds' may be necessary
- etc.
Remember that every time you give a 'factoid' someone is going to ask a follow up question so be prepared. Perhaps listen to the Astronomy 161 and 162 lectures again.
5. ensure that everyone is warm (have extra jumpers handy). My friend's wife was very interested in the views but was too cold to look for long.
I am sure that IIS members already have thought of these and many more useful tips for "star parties"; I am really using the forum to record my own observations about improving my entire atsronomy experience.
cheers,
DJDD