For those interest in Night time photography, have a look at the link from Niamh Boyle
http://prodigalconcepts.com/30-night-time-photography-inspirations-for-beginners/, worth checking out!
And as a follow up Ian McGuirk found a website to download your photos to achieve a startrail.
www.starstax.net,
There is a link to the software here
http://www.markus-enzweiler.de/software/software.html