sus chords

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Neither Major nor Minor. Neither happy nor sad.

Ambiguous and full of intrigue. Use them all the time.

Don't use them too much though, or you end up sounding like Andy Summers.

Sometimes they are essential. Some might even find they are the 'lost chord'.
Sometimes nothing else will do. To take it to a Major or Minor bent just kills the feel.
The neutrality that a suspended chord gives can be invaluable.

And for some reason they are usually pretty easy to finger on the guitar no matter what the inversion.

Suspended chords are at least as important to learn as Sevenths. In fact, you may end up using them even more depending on style. I play a lot of Major and Minor Sevenths and that is my style. I have a friend that plays Sevenths (that is standard Sevenths, which are different of course), and his whole sound is a million miles away. Though we gell together very well and compliment each other when playing. For standard Seventh, I mean Dominant Seventh. I think.

http://en.wikipedia.org/wiki/Seventh_chord