Unpacking RPM files
rpm2cpio and yumdownloader
If you ever happen to want to get some files from an RPM to do whatever you want with them, you could:
yumdownloader <package>
rpm2cpio <package.rpm> > file.cpio
cpio -idv < file.cpio # extracts from file.cpio all package files into the current working dir
Pretty simple and small, but a good tool to have if you need it.