If you're interested in astronomy, VHF DXing or both, then the Perseids Meteor shower, peaking around 11/12th August is going to be of interest to you. Reflections are starting to build up and this morning, as I was sat listening to 144.300 there were already some sizeable reflections.
If you've not tried meteor scatter before, why not set your receiver to one of the calling channels; 144.300, 50.150 or 50.110 or even 70.200 and listen for a while. With any luck you'll start to hear some reflections.
Read more about the Perseids here: http://science.nasa.gov/headlines/y2009/31jul_perseids2009.htm