robzilla - 1:34 pm on May 18, 2009 (gmt 0)

The new referrer URLs will initially only occur in a small percentage of searches. You should expect to see old and new forms of the URLs as this change gradually rolls out.

[analytics.blogspot.com...]

If I access www.google.com directly, which I rarely do, I get the new URLs. I do not, however, when I use the search box in Firefox or when I search from my iGoogle page. International Google homepages also seem unaffected.

I'll join you in removing filter #3, and may also get rid of #1 and #2.