Weblogs and Fair Use?

CBNobi asks: "Most large news distribution sites do not archive news articles after a certain period of time. Being a weblog 'author', I sometimes write editorials in response to the articles. It is difficult for my rants to stay relevant when I end up linking to a dead page. I've read the fair use laws, but is vague on digital storage. So, my question is - how do fair use laws apply to the digital setting, where it is non-profit, but can be seen by others? (Or alternatively - is there a public, digital archive of news stories?) I find it odd that it is [usually] fine to link to news stories, but it becomes copyright infringement once it becomes impossible."