I came across an entire online video course on Armenian Hymnography. The course is from St. Nersess Armenian Seminary in NY.
The link to the first course is: http://www.ustream.tv/recorded/12302542
They also get into Byzantine, Syrian, and Georgian traditions of hymnography and how the Armenian tradition was influenced and influenced those traditions as well. More importantly, the theology of the hymns are discussed in details, and that would be very interesting in terms of the hymns that we share with our sister Church.