This update covers the 15 minutes prior to 08:15 UTC.
Montana gets called for McCain. The range of possible results narrows a bit more.
McCain Best Case: Obama 338, McCain 200
Current "everybody gets their leans": Obama 349, McCain 189
Obama Best Case: Obama 375, McCain 163
If one sticks to one common definition of landslide, namely 375 electoral votes or more, Obama now needs to sweep the remaining three states for this to be a "landslide". Of course, there is no single accepted definition of landslide, and some people will be calling this such regardless.
Still waiting on North Carolina, Indiana and Missouri. Still no deviations from the predictions this site had with the "everybody gets their leans" line immediately before the polls closed.
Of course, various places are now calling Indiana for Obama. If CNN eventually decides to agree, that will be the first deviation from predictions, as the five poll average here had McCain again by 3.4% heading into the election.
Edit 09:24 UTC - Added the slug about the time the update covered, which I had forgotten when I originally posted.
Edit 15:15 UTC - A reader pointed out that Iowa was the wrong color in the map above. This has been corrected on the main page and on this post but not on the two older posts that were effected. (Although I have added notes on those posts about the error.) Bad paint tool. Bad. The numbers however are correct.