The Space Shuttle Columbia has broken up on the approach to landing in Texas. All seven astronauts are clearly dead. This is terrible, terrible news. Dave Winer has a good compilation of links, and will be updating it throughout the day. There is also good coverage over at Samizdata , and Glenn Reynolds is doing pretty well also.

Update: Dale Amon's coverage at Samizdata has been absolutely first rate. Dale has added a lot in the comments section, too, so it is worth looking at those as well as the posts.