Without wandering too far down a commercial endorsement/off topic road -
GizmoJoe's mention of sunblock on the ManOWar thread brought up this thought - who's had good results with what, assuming there's really any difference ?
EE's lady (originally from Idaho, 3rd generation fair skinned Scandanavian) swears by a brand name called Bullfrog. Used to be a bit to find, but a lot more common now.
I use what ever is cheap. Normally I never wear it but since i am on the water ALOT now, it seems I need it. Lately I have been using a generic spf 30 while on the water. On land I dont need anything. Go figure.