You did.

The future is now: Wizards now have a really good way of distributing errata: the D&D Compendium and Character Builder. 99% of errata will likely be to words that are in those sources. They should (and will) maintain the free errata as well, but by its very nature it just can't be as good.
Respectfully I have to disagree.
The Compendium is great IF you know (exactly) what you're looking for. If you don't, then it's awful. You could spend hours searching for something. The search engine itself is horrible. I've often searched for something and simply had the incorrect tense and it would come up with nothing. So I'd have to try every permutation of the word I could think of until I was lucky enough to hit on the right one, if I did at all.
The real problem with that is that it's not in an easily readable layout where one logical conclusion follows on to another. How do hit points interact with abilities and weapons and damage? None of that is covered in the Compendium. Yet these things have changed, and often not in subtle ways.
Then there's the reverse problem. How do I know it's been changed? If I'm flipping through the book, how the hell do I know if a rule's been changed or not? All the 'solutions' are crappy. I don't want to mark my book. I don't want loose-leafs flopping about in-between pages. And copy-paste... seriously? No.
In other words, it's a nuisance.
Would it be nice if they had a PDF of the rulebook which they kept updated? Yeah, it really would. Unfortunately, this is something that is likely just Too Expensive. Although updating a few words here or there isn't really too much to ask for, unfortunately it is a lot more involved than that: layout is a pain. Once you have this happening to multiple books every month - as they do - urgh!
Y'know, I've worked for a magazine as an assistant to an editor and I've studied both as a hobby and through courses, layout and design. I am no expert, by any measure, but I am constantly seeing people espouse the opinion that layout is difficult.
It's really not. It's a piece of friggin cake. InDesign and Quark are like any other program. Once you learn the fundamental tools within it, you can quickly and easily manipulate files. And the more skilled and practiced you are, the quicker you can do it. Altering content within a predefined print layout really isn't that time-consuming. All the hard work has been done already. The content that they're altering every few months would take someone at a professional level of skill, at most a few hours to incorporate in a PDF document just before release.
Two or three hours every two or three months is chump-change for a service that would massively increase WotC's popularity, and decrease their detractors.