A weakness of blogs

I was over at Instapundit tonight, digging through his archives to see how he handled posting on 9/11. One of the weaknesses of blogs (and the entire internet news industry, really) became readily apparent. Blogs and internet news have a significant hole which could render them difficult to use as historical "documents," and that is the lack of reliable online archives for websites. I went through Reynold's coverage of the day and clicked on every link. The majority were dead. For those of us today who can more or less remember 9/11 clearly, that isn't much of a problem. For a historian 100 years from now, that may be a problem because those links provide the context for the commentary at blogs.