I think calling it a "huge mistake" is pretty unfair! There have been a lot of changes, and something is always going to be missed, give the guys time to settle in with the new site.
Going forward, it is something to look at because, although Chris is correct that you can still (sort of) find your way to everything, it is not very convenient, and on the web convenience is everything. There are a number of ways this could be addressed eg: a long list of article titles organised alphabetically, similar to the way it was on the old site; some kind of keyword tagging; google style ajax filtering of a search box that searches as you type character by character; a "search articles" page with a drop down list that allows you to switch the display a list of articles by various options in a drop down list. There are probably many other ways to do it.
One way to decide on the right option might be to ask the community - either using a poll or survey or by providing A/B test style random options and use stats to work out what people like best.
But the most important thing to do first is iron out the priority to bugs, let the site bed in for a while and let the guys have a breather to enjoy their efforts. Then the refinement can happen...
This is a huge mistake.
The archive of Michael's old articles/reviews etc. is a treasure trove of information.