For those of you who are not used to reading these types of illustrations or diagrams I thought I would include some explanation on them. I usually draw a standard guitar neck diagram that would appear the same as it would when you look down at your guitar or bass neck. What you will see when looking at the diagram below is the "low E" string (the fattest one) on the bottom, and the "high E" (the thinnest one) on top. This should be easy to tell as the string sizes are visible on the neck. If you have not yet memorized the string names, they are listed right here and now would be an excellent time to do so.
|^ Neck Diagram ^|
In actual diagrams, you will see dots on the fretboard marking where the notes should be played. They will be in various colors and will mean various things.
Also, if you see note markers that are all the way at the end of the neck, and are not in between frets where you would put your finger, but rather right on the "nut" at the end, these are "open" notes and do not need to be fretted at all.
* note for bass players: Bass players can use the exact same diagrams as the guitar diagrams, using only the bottom four strings (low E, A, D, G). This means that everything is the same for bass, you would just ignore the B and High E strings. (this can change for 5 string basses, etc)