Two a Days - What workouts do you do?

Ideally, you will do the higher intensity workout first.

Your current schedule has 2 swim, 2 bike and 3 run sessions. Personally I would ditch all the strength sessions and add another swim and another bike (oh, please dont make this another one of THOSE threads, just my opinion).

At the very least another bike session should be added. I feel 3 run sessions is negated by lack of bike fitness. Being in superb run shape is no good if you are wasted when you get off the bike.

Question about this. Is this because you end up diminishing your second workout if you aren't fresh (and thus, can't ramp up to the same level of intensity as you normally would)? Or is there another reason that I haven't thought of?

I ask because I feel that sometimes my 'second' workout of the day is actually stronger (might just be perception) than my first. 

If you've got 1.5 hours, why not at least do a short run or ride before your strength sessions--even 20-30 minutes will help.

And how long is your long run?  You might be able to do that as one of your runs during the week one day and use Sunday for a long bike (which you don't seem to have time for in this schedule).

Yes, of course it depends on the intensity of the first w/o) and time between workouts. Nutrition also plays a part. With day/ night workouts, as in your case maybe even more so. e.g. your diet may provide you that added "boost" you feel.

You need to figure out what works for you.

I found if I did strength at lunch my swims at night were great..but that is just me.

Honestly what I do is mixed up based on what I can do each day trying to get 3 swims & runs & 4 bikes in with 2 strength training...tough juggling and I don't run back to back days unless it is the only way it flows.