help from electronics gurus? 555 timer

[kwirky]

I got it working with an aluminum capacitor!

this link helped a lot: http://www.iguanalabs.com/555kit.htm

It's just blinking an LED on 15 seconds, off 15 seconds. Now to find myself a 12V 300ma power adapter (for the relay).

I've only got the one 100uF aluminum capacitor. I omitted the 0.01uF capacitor which I saw in most of the other schematics. I followed the directions in the above link and it worked anyways. Know how this would affect it in the long run?

Oh, and how does one wire up a snubber? does the uF and the resistance have to be calculated?