Found this on a blog I follow: NTC Masters Workout - the coach does an awesome job of throwing up routines to use. This one is a good one I think I'm going to strive to achieve as I embark to lose my stomach.
450 warm up (100 swim/50 kick)
6x25 kick @ :60 (1 easy/1 FAST!)
3 x [100 easy swim w/:15 rest
50 FAST!! kick w/:30 rest]
50 easy
6x25 pull @ :60 (long strokes)
3x150 pull w/:30 sec rest
6x25 @ :60 drill
6x75 w/:30 sec rest (free/non free/free by 25)
100 cool down
*2500 Total*