Watch the The Spice online guitar lesson by Brad Carlton from Chord Studies: Open String Chords Vol. 1
These A madd9, A sus2sus4 and A 9sus4 open voicings are fairly easy to finger (exception being that first A madd9 voicing). This study is a great example of using open strings to craft interesting spicy voicings with virtually any type of extension. Watch that low E string again!