I have a small SP scenario page on my website, but it may be unindexed.
http://www.geocities.com/ekapic/sp/
They're somewhat old, however. My favourite is the Gibraltar scenario (the one that's included in SPWW2) and the "Village Visitors".
Four of my scenarios are included in SPWW2: Operation Felix, Operations Roesselsprung, Nuevas Tacticas and Carretera de la Coruņa.