Just whelped my first liter on 3/26/09. I too have both Mommy (Lola) and Daddy (Jojo). It was a stressful time but she was a rockstar. I read about everything that could go wrong on all sorts of websites....but, thankfully, it was textbook. No intervention needed except I did pull the sack off the head of the pups and then let her do the rest. You can see photos on my site/album. I'm still new to yorkie talk so not very savy yet.
Lola is my avatar photo....sooo cute. Good luck and shout if you need any help or have any questions. I'm certainly no expert but know a lot more now having gone through the process.
Get ready for a lot of noise. My almost 7 week olds (3 girls/1 boy) just learned to bark!! Oh...what fun. Not so much at 5:00 am but so darn cute you can't be mad.
Again....keep us posted. I'm in the Minneaplis area.