There is a pattern that makes it easier to learn....2 frets up, 2 strings down...this will get you started.

Here's an example: 6th (low E) string, third fret is a G. Move up to the 5th fret (2 frets up) and move 2 strings down, which would be the 5th fret on the 4th (D) string, this is a G an octave higher....the pattern continues except when your moving from the 4th (D) string to the 2nd (B), then you move 3 frets up....

This doesn't cover everything (like finding the G on the 5th (A) string from the G on the 6th (Low E) string), but it can get you started on finding the patterns.

Just remember, everything in music is mathmatical (sp?) and involves patterns. That's how I learn is by figuring out the patterns. Make a copy of the fretboard and highlight where each G note is. Do the same thing for the remaining 6 whole notes with 6 other copies of the fretboard. Now compare and find the patterns.

I typed that kind of fast, so if anyone finds an error in my listings of notes, please correct me.