Here is a compliation of various poses listed on various websites.
Recommended Poses:
Pigeon
Warrior II
Triangle
Ardha Chandrasana
Knee to Ankle (Agnistambhasana)
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Cobblers pose / Bound Angle pose (Baddha Konasana)
Mountain Pose (Tadasana)
Seated Forward Bend (Paschimothanasana)
Hero Pose (Virasana)
Fish Pose (Matsyasana)
Tree Pose (Vrksasana)
Bridge pose / Half Wheel – Setu Bandha Sarvangasana
All fours positions like Cat – Cow can help get the baby into the optimal position for birth (head down, back to your belly.)
During the third trimester, inverted poses should be avoided.
From about.com:
At around 36 weeks, you are advised to decrease the number of inversions. The baby is moving into the birth position at this time, so you don’t want to do any poses that may alter his or her position in a negative way. You should stop doing Legs Up the Wall and Bridge Pose, unless your baby is breech, in which case these poses can help her to turn. Poses done on all fours are also good for turning a breach baby. You should also decrease the number of Downward Dogs you do, since Down Dog is a mild inversion, substituting hands and knees pose. In addition, stop doing any pose that becomes uncomfortable. Squats continue to be appropriate to the end of pregnancy, unless you are at risk for preterm labor.
NOTE: During pregnancy, the body produces a hormone called Relaxin. This is for the purpose of SOFTENING the muscles and bones in the body to allow for safe expansions. DO NOT practise yoga poses that focus the stomach, and do not strain yourself. Yoga should be used to open your body and to quiet your mind.