"Periodic Library is an interactive periodic table of the elements. But it is more than simply a computerized version of the standard periodic table. It takes full advantage of your computer's capabilities to give you an in-depth look at the elements that make up our earth, the solar system, the galaxy... well, let's just say everything. "

While not quite the elactronic CRC Handbook of Chemistry & Physics, there's an enormous amount of info packed into this 264 KB download. Cleanly unpacks into a folder (no install), <img src=/S/free.gif border=0 alt=free width=30 height=15>ware naturellement <img src=/S/smile.gif border=0 alt=smile width=15 height=15>.