I do see more pages from my sites in the SI and I see pages in the SI returned in SERPs far more often than I used to.
The no-longer-so-called SI, as I understand it now, is simply all the pages that don't have
PR ... and there are certainly a lot more of those at the end of this year than there were in January 2007.
We have seen two rounds of
PR slashing, and while the fanfare has revolved around the reduction of
PR on link selling pages and sites, Google was equally busy this year removing
PR from reciprocal link pages. Many of my sites lost a
PR point overall, but none of them changed positions in the SERPs.