UV filter plus circular polarizer will help with sky shots by reducing
the background glare,good edit by bahadir.......................musket.
...and good suggestion from musket
aboutthe use ofa circular polarizer that really works especially when the direction of the light source and the the direction of your lens makes 90 angle, the particular pointthe polarizerreaches its maximum effect!However, you've got to checkfor a decentadaptor for your compact camera first and buythe polariser according to the thread size of the adaptor
If there's none, you can make a home made one, as I did! Ah, this was the moment I purchased my dslr though : )