Can anyone offer me a little advice please

I have a 1,000Mhz Athlon and I have be looking into overclocking. I have read a few sites guides but I don't want to do anything drastic like opening up the CPU's case just yet, though I am interested in messing about with some of the multiplier/voltage settings from the BIOS.
I understand that CPU clock x Core/Bus ratio = CPU speed, but I don't understand the settings in my BIOS.

I my BIOS, in the Frequency/Voltages menu I have this sub menu;

"CPU Host/PCI/Spreed Spec."

Which can be set to a number of values which are;

* Defualt
* 100/33Mhz/-0.5%
* 100/33Mhz/+0.5%
* 102/34Mhz/off
* 104/35Mhz/off
* 106/35Mhz/off
* 107/36Mhz/off
* 108/36Mhz/off
* 109/36Mhz/off
* 110/37Mhz/off
* 111/37Mhz/off
* 120/37Mhz/off

My PC came with the setting at default. So I changed it to 110/37Mhz/off then rebooted. My PC is now being reported as being an Athlon 1,100Mhz. I have not tried all the settings but most other settings seem to either have no effect or turn my PC into a Athlon 360Mhz!

Could someone explain what these settings mean and if possible tell me what settings it should or should not be.
I quite like the idea of having a 1,100Mhz Athlon but am I going to fluff things up.
Please don't post telling me that I need extra cooling etc, I know all that, i would just like to know what these BIOS setting are all about.
My Mainboard is a Micro-Star MS-6340 which uses a VIA KT133 chipset.
I think the 110 bit is the FSB frequency bit but I don't get the 33Mhz etc. The sites I have looked at refer to multipliers like 7.5, 8.5 etc. and what does Spreed spec. mean?

Cheers in advance.

PS remember, we were all new once!

Cheers for the reply mate. So are you saying that I best leave those settings in my BIOS well alone, even if I am getting a speed increace? could it do damage? or shall I just leave it running at 1,100Mhz or set it back to 1,000Mhz?

Ok, some questions seeing as you are so helpful

1) How do I close the L1 bridges - does it involve taking the CPU casing off?
2) Do I have to close the L1 briges before I can increase the multiplier?
3) How do I change the multiplier if I can't do it from the BIOS - does this also involve taking the CPU caseing off
4) How far can a 1000Mhz Athlon be pushed?

Thanks.