Informative report from one of the most trusted polling agencies in this field. It's worth noting that this final estimate is based on Gallup's traditional likely voter model, and assumes an estimated turnout of 64% of the voting age population, an increase over 2004 ( fueled by a surge in early voting and higher turnout among blacks). If you pull out undecided voters the poll data shows a 53% to 42% margin for Obama.

It is notable that they say a little about their polling via telephones and cellphones. The surveys are useful, as they help quantify the degree of fraudulent vote counting.

This is perhaps the most important empirical poll on the eve of the most important polling day, and indicators show an easy win for Obama. Then again, there are variables that we are encountering only in this election, such as use of cell phones (omitting a key demographic for Obama) as well as voter overconfidence (which Obama has been fighting). While early voting has gone in favor of the Democrats, too much publicity about an easy Obama win may keep remaining voters at home, and that plays to McCain's favor.

This poll is well documented and has good analysis.

This is straight forward reporting of polling data embellished with lots of analsis and opinions that are not so straight forward. There is certainly no humility is this Gallup writeup.

This is an excellent discussion of polling results. It explains the three polls Gallup have used through the campaign and how they are different. Most important is the results come together at the end of the campaign.