I find it very satisfying that although my wife and I are getting divorced, I can still kiss her good morning, wish her happy Valentine's day and tonight I'll probably tell her to have a good time on her date as I hug her goodbye!

Nothing about our relationship has ever really been conventional :-)

Flowers? Card? Good sentiment, but I'd try something from the heart: paintball, horseback ride, hot air balloon trip, have the in-laws watch the kids while you two disappear to the sleazy motel around the corner for a few hours, or just bake him/her a huge chocolate cake and eat it naked in front of the fireplace with a nice Zinfandel.