Sunflower,
I usually use yoga or pilates as an add-on to my Cathe workouts, usually for 15-30 minutes. In addition, I do a full 45-60 power yoga practice once a week. Here's a rotation I was doing in May:
SUN: Full Yoga (usually Bryan Kest or David Swenson Short Forms)
MON: Bootcamp
TUE: Off
WED: Muscle Endurance + last 15 min B. Baptiste Power & Precision Yoga
THU: Imax 2
FRI: PUB + last 15-30 min Baron Baptiste P&P Yoga
SAT: PLB
Sometimes I would add 30 min of cardio to my Sunday Yoga workout (usually C&W step portion).
I've always wondered what doing a yoga-only rotation would do to my strength and I just did such a rotation for 2 wks while visiting my parents, using Bryan Kest 1, 2, 3. I've been back to Cathe for a week and I find I did lose some strength. I'm sure by next week, though, I'll be back to what I was lifting previously. I plan on combining cardio/strength workouts in one day so I can add more full yoga workouts to my routine for the next 4 wks or so. I've made some good progress in my yoga practice.