Fencer: Here is an example:

(;SZ[19]HA[0]KM[5.5]
PB[Ceiter]
PW[ikkentobi]
;B[dp];W[pd]
;B[cd];W[pq]
;B[ec];W[cj]
;B[ch];W[cm]
;B[co];W[jq]
;B[qf];W[pi]
;B[qc];W[qd]
;B[pc];W[od]
;B[rd];W[re]
)


The file on top was created with my proggy.

(; - it starts with an open bracket and a semicolon

SZ - Bordsize
HA - Handicap
KM - Komi
PB - Black Players Name
PW - White Players Name

After the game properties comes the move list.
Every move is seperated by a semicolon.
You could write:

;B[dp]
;W[pd]
;etc.

B stands for Black, W for white
The small letters are the bord coordinates:
aa would be the upper left corner and
ss the lower right on a 19x19 bord.

) - the file ends with a closing bracket

For more information see:
http://www.red-bean.com/sgf/