The chart below is based on Tim's logging of inventory shown on the SB home page. It compares the growth on all of the series indexed to 100% at 7/12/2007.
I thought it was interesting to see how Snoho and King Co Condo growth is outpacing everything else. And as discussed here before, condo inventory is probably underreported as most new units never go on the MLS - so reality may be worse. I was also surprised to see how rapidly King Co SFH inventory was growing in comparison to the other series.
For a bit of historical context, SFH inventory growth (I don't have the numbers for condos) between July and September for 00-06 averaged 3.4% for KC, -0.6% for PC, and 1.7% for SC. This year, only the Pierce County growth is in this range.