If anyone would care to please recommend excellent recordings of Schumann's Lieder, male or female vocalist, I would be much, much obliged 
The two most important cycles are the Eichendorff-Lieder op.39 and "Dichterliebe" op.48.
Despite a lame pianist, I like the Dichterliebe with Wunderlich for his glorious voice (filled with Schubert and Beethoven, I think). Despite his somewhat dry voice I also like the op.39 (+ op.48, although there are different, usually cheap, issues with different couplings) by Schreier/Shetler (they did most of the important Lieder but I don't know the rest very well, if one generally likes Schreier, it's probably worth getting the whole bunch cheaply from Berlin Classics).
As I also got a live Orfeo disc with Fischer-Dieskau singing op.39 and 35 this must have been very good because I have this singer also in several older studio recordings in boxes with this music.
Then probably the Kerner op.35 (a loose collection, a bit uneven, IMO) and the "little Dichterliebe" (i.e. also Heine lyrics and a similar theme) op.24. In addition to Fi-Di I like Pregardien/Gees.
I never really got into the main "female" cycle, "Frauenliebe und leben" but op.39 and op.35 are also frequently sung by women, although I tend to prefer male voices.
I also love the mixed recital already mentioned with Ameling/Demus (although I think more for the Schubert).