I've given talks on the following subjects at the Southern Peninsula Astronomy Club:
The Life Cycle of Stars	28 April 2005
Lesser Objects of the Solar System	27 October 2005
Relativity Demystified	24 May 2006
The Astronomical Magnitude Scale	28 February 2007
Black Holes	26 April 2007
The Big Bang	31 January 2008
Classifications of Stars	30 April 2009

Want to find out more?

NASA's Spirit rover landed on Mars in 2004.
Follow the Cassini spacecraft as it orbits Saturn.
See the results of the Galileo mission to Jupiter.
There are various lunar spacecraft operating.
What's the latest on the 2001 Mars Odyssey ?
Future missions to Mars are being planned.
Old faithfuls Pioneer and Voyager just keep on going.
What future space missions are being planned ?
Want to know about Planets outside our Solar System (exo-planets) ?

Other links :
 - The Nine Planets (a superb site)
 - NASA
 - NASA's Space Science site
 - NASA's Jet Propulsion Laboratory (JPL)
 - Space.com
 - Space Daily
 - Phil Plait's Bad Astronomy site
 - Association of Lunar & Planetary Observers site
 - National Science Foundation (in the USA)
 - World Year of Physics 2005
 - SA Astronomical Observatory (Sutherland)
 - Astronomy Online (a private site)

Astronomy Magazines :
 - Astronomy Magazine (from USA)
 - Astronomy Now Magazine (from UK)
 - Sky & Telescope
 - Sky at Night (a BBC publication)
 - Popular Astronomy (published by the Society for Popular Astronomy)

Science Magazines :
 - Scientific American
 - New Scientist
 - Popular Science
 - Discover Magazine

Still interested? I recommend the following books on astronomy and physics :

Title	Author	Remarks
Big Bang	Simon Singh	An absolutely superb account of how the Big Bang theory of the universe's creation came to be generally accepted.
The Fabric of the Cosmos	Brian Greene	An excellent general explanation of the current state of the various theories in physics, from relativity to quantum mechanics to string theory. The main pages of the book are oriented to the layman, but much more detailed and mathematical explanations of many tricky concepts are included in an appendix.
Black Holes and Baby Universes	Kip Thorne	Everything you ever wanted to know about black holes and how Einstein's theory of general relativity affects them.
Warped Passages	Lisa Randall	Insightful explanations of some of the weird concepts of quantum physics, as well as an introduction to esoteric ideas such as Brane Theory.
The Trouble with Physics	Lee Smolin	A layman's overview of some the issues plaguing modern-day theoretical physics, principally concerning String Theory (which is still unproven and seemingly unprovable).
The Universe and Life	G. Siegfried Kutter	A detailed but readable explanation of cosmic evolution.
A Brief History of Time	Stephen Hawking	A classic book, written by the most well-known scientist of our era, but unfortunately quite hard to read.
The Rough Guide to the Universe	John Scalzi	Part of the excellent "Rough Guides" series, this is an outstanding introduction to everything in the known universe. Very good for beginners or if you want to look up something that you can't quite remember. Well structured and laid-out with plenty of photographs, illustrations and diagrams.
The Universe - A Biography	John Gribbin	A good, very up-to-date summary of everything we know about the universe. The book describes how the universe began, what the early universe looked like, how its structure (stars, galaxies, etc) developed, what emerged to hold it all together and how life as we know it emerged.
A Short History of Nearly Everything	Bill Bryson	Not strictly-speaking a serious science book, but I've included it because Bryson is an outstanding writer and manages to explain complex issues simply, clearly and with his characteristic sense of humour.