there hasn't been a PageRank update in 6 months

At least the toolbar PR. Is 6 months a new record for longest without a PR toolbar update?

No there hasnt been a google PR update for at least 6 months. Longest I've ever seen.

But, they are updating algorithm frequently to hammer us.

As long as your site is ranking pretty well, receives huge volume of targeted traffic...that's fine

Personally, I don't care about page rank anymore whether Google update it or not as long as I'm ranking and earning... that matters most to me

Unless, you are selling links, you would be worried about no updates in page rank.

Just my 2 cents