Other alternative tunings:
D A D G A D (lowest to highest)
Most chords are fairly simple in this tuning. For example, a "D5" chord is as follows:
D ---
A ---
A -2-
D ---
A ---
D ---
A "G" chord is fairly similar:
D ---
B -2-
G ---
D ---
A -X-
D -X-
Remember that an "X" means that the string isn't to be played, and a number stands for which fret is to be pressed on the string.
Another tuning is E A B E B E (lowest to highest). This tuning was used by Jars of Clay for the song "Flood". Some chords in this tuning:
"E5"
E ---
B ---
E ---
B ---
B -2-
E ---
"A"
E ---
C# -2-
E ---
C# -2-
A ---
E -X-
Other chords can be worked out by studying the chords on a standard tuning, and studying the string-tuning for individual strings.