I bought Kurz' video about nine months back or so. I never really got into the full regimen he reccommended (a lot of equipment/time's needed), but I did manage to increase my flexibility to a fair degree with this watered down version.
Warmup
30 front snap kicks just alternating in place.
Dynamic stretching
10-15 Front, side and rear leg raises
Kicking drills/shadowboxing
Just went though my catalog o' kicks and worked combinations etc. Try to pace it so it wasted 30mins to an hour.
Final stretching
Front and side splits. Tense the legs like you're trying to push your knees together for about 10 seconds, then relax and try to deepen from there. Repeat that until you're down as far as you're gonna go then hold for 20 seconds. Front and side each get a set of three with a minute and a half recovery rest in between.
Kurz aside, a lot of people really like the book, Relax Into Stretch for improving flexibility too.