I started a thread here the other day called "Where's the Caffeine?". If anything google is less fresh than before when I look at the cache dates. I have a pagerank 6 site with millions of pageviews per month with the homepage showing a 10 day old cache date, and even worse on internal pages.
However, my traffic from google is up since the Mayday update, especially in the last week or so. I am not making a lot of sense out of this, but do hope google can get back on track with the freshness. We put a lot of work into updating the site each week.