Jonathan that’s a fair point. We’re trying to strike a balance between the feedback we’ve received from our users and balance fresh content vs best overall. At the moment, we’re biasing our results towards fresher content (it results in higher click through rates) for most sites.

In terms of coverage of our index, there is nothing stopping us from indexing your entire archive (and it’s not that expensive), the challenge is usually the reliability of the process. Namely, we rely on the RSS feed of your blog – so if your feed contains all of your content, we can easily index that. Likewise, if you want to expose a feed of the entire archive, we can index that. Our goal is to provide complete coverage, and we’ll be working towards that in ‘09.

For one, this strikes me as a bit contradictory. Relevance of my posts on my blog may very well be high for older posts; especially if my blog is less about current/timely events in my niche vs. providing more timeless content (such as advice pieces, lists, etc). What I’m saying is that if PR does not index everything, then it IS possible that it will miss even your most important post if its from a year or more ago, right?

Now I don’t expect you to have vast server farms indexing these blogs — that’s Google’s job; but will PR eventually index everything? Otherwise the service seems incomplete to me.