Herb,
There is a fairly comprehensive site on the US Medal of Honor at:
http://www.cmohs.org/

As far as the Purple Heart, it is my understanding that it was awarded during the Revolutionary War by Gen. Washington, but was not awarded again until 1932. Another good site to look at on the Purple Heart is:
http://www.purpleheart.org/explanation.htm

As far as Confederate medals....they were authorized by the CSA Government in Richmond, but never minted or issued. This is from my site on the 9th Georgia Infantry, an excerpt from the O.R.:

GENERAL ORDERS, No. 131.
ADJT. AND INSPECTOR GENERAL'S OFFICE,
Richmond, Va., October 3, 1863.
Difficulties in procuring the medals and badges of distinction having delayed their presentation by the President, as authorized by the act of Congress approved October 13, 1862, to the officers, non-com-missioned officers, and privates of the armies of the Confederate States conspicuous for courage and good conduct on the field of battle, to avoid postponing the grateful recognition of their valor until it can be made in the enduring form provided by that act, it is ordered--
I. That the names of all those who have been, or may hereafter be, reported as worthy of this distinction, be inscribed on a Roll of Honor, to be preserved in the office of the Adjutant and Inspector General for reference in all future time, for those who have deserved well of their country, as having best displayed their courage and devotion on the field of battle.
II. That the Roll of Honor, so far as now made up, be appended to this order, and read at the head of every regiment in the service of the Confederate States at the first dress-parade after its receipt, and be published in at least one newspaper in each State.
III. The attention of the officers in charge is directed to General Orders, No. 93, section No. 27, of the series of 1862, Adjutant and Inspector General's Office, for the mode of selecting the non-commis-sioned officers and privates entitled to this distinction, and its execution is enjoined.
* * * * * * * * * *
Battle of Gettysburg:
Georgia:
Ninth Georgia Infantry:
Lieut. Col. John C. Mounger. (killed in action 2 July)
Private P. B. Millican, Co. B. (killed in action 2 July)
Private Thomas J. Michael, Co. C. (wounded: died 20 July Martinsville, Va.)
Private James W. Mann, Co. D. (killed in action 2 July)
Corpl. Joseph A. Hough, Co. E. (wounded: left in Union hands: died from amputation of left arm 9 July)
Private Jesse McCullar, Co. F. (killed in action 2 July)
Private John Mills, Co. G. (wounded and captured 2 July: died: no date given)
Private Chesley Alderman, Co. H. (wounded in leg and captured 2 July: died from amputation of leg in hospital near Gettysburg 19 July)
Corpl. Luther J. Copeland, Co. I. (killed in action 2 July)
Private Henry F. Daniel, Co. K. (killed in action at Funkstown, Md. 19 July)
* * * * * * * * * *
By order:
S. COOPER,
Adjutant and Inspector General.

......hope this helps........Neal