yep its fifths. Just get a picture of it and it will help you when it comes to keys and scales.
Musictheory.net is good
Fretpro is a good program for memorizing the fretboard.
I practice each of them every day.

"Circle of fifths is pure theory, and has little to offer in the way of playing the guitar. It's egg-head stuff that give you a deeper understanding of musical theory. To me, theory is mathmatical, and circle of fiths is no exception. It's the relationship of keys as denoted by their notation on the staff, ie: number of sharps and flats. "

It's the relationship of keys whether notated or not. Even if you don't read notation it helps to know what notes to sharp, and what notes to flat in any given key. If that, in and of itself, doesn't have a very pragmatic application to guitar I don't know what does. I find it annoying that guitarists tend to seperate themselves from the rest of the musician world, and for some reason think that learning "the egg-head stuff" has no application to what they could potentially do, like I don't know, READ MUSIC.

"If you google it and find a picture of the circle, start from C and count up a fifth, you'll get to the keys with sharps. If you count down a fourth, you'll get the keys with flats, in order of course."

Actually you count up going in both directions....the first flat key is F and although the circle goes counter clockwise for flat keys, your counting does not go down, as a fourth down for C (for example) would be G, and not F.

The way to READ, the egg headed circle is by numbers of sharps and flats correlated to the order of sharps and flats.
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Sharp Keys:

G-D-A-E-B-F#-C# = 1-2-3-4-5-6-7

Order of sharps: F#-C#-G#-D#-A#-E#-B#

So if you can count to seven, and remember the order of 7 letters, you basically have the tools to unlock the seven sharp keys.

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Flat Keys:

F-Bb-Eb-Ab-Db-Gb-Cb

Order of flats: Bb-Eb-Ab-Db-Gb-Cb-Fb

Again, if you can remember the order of seven letters, and count to seven, you have the tools to unlock all seven flat keys as well.
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So how does this help you play guitar? Well, can you play in all keys? Do you know the notes contained within those keys? If not, learning the circle will fill that gap. How to learn it? Memorize the poem:

G-D-A-E-B-F#-C#

As you say each KEY count with your fingers to keep track of the corresponding number of Sharps in this case. It's something you can practice on the bus, driving to work, bored in class, or taking a dump.

Once you have memorized the Poem and each keys corresponding number, the only thing left to learn is the order of sharps. F#-C#-G#-D#-A#-E#-B#

Now once you have leaned it, say somebody calls out the key of F#. Thats at 6, six sharps, every tone is sharp except B. This is a tool to help you learn your keys, eventually you wont have to count, you will just know automatically how many sharps or flats are in a key, and what they are.

You can also use it to practice your scales. Moving around the cycle of fourths is a very practical way to practice common key changes, as each progressive step around the circle takes you to the next closely related key.

"ok i have a question about the poem G-D-A-E-B-F#-C#

I was thinking what about regular C and F, but i guess since there is nothing in front of them, theyd have to always be sharp, right?
what i mean about nothing in front of them is like theres no B# / Cb and stuff"

That's a fantastic question. C is no sharps, no flats...the "natural key" , and F is the first flat key. The answer to the second part of your question is there is no B# key, as that would be C, and although there is a Key of Cb, most will use the enharmonic key of B, as there are fewer accidentals.

Plus, you just pointed out another benefit of learning AND KNOWING your keys, as not knowing leads to confusion such as what about B# keys etc....not knowing the egg headed stuff leads to all kinds of unneccessary confusion that can be avoided by doing the basic work.

"m memorized them on the fretboard,. I don't consult a picture called the circle of fifths! And yes! I maintain that it's egg-head stuiff!"

okay.. what is the 5th to F. ??

Nope, I've said my piece.