I have been buing a few different solar powered lighting options recently. my most recent purchase was a d.light from http://www.dlightdesign.com/home_global.php it is a portable solar powered cube shaped light. It can be charged with either the included solar panel, or a Nokia phone charger. It has a few output levels and is quite durable.
Even in my overcast locale the panel seems to charge the unit quite well.
If you are looking for a portable solar powered light source check it out.