If you're a newspaper junkie, you may already know about the Newseum website. But I've just found out about it and I can't take the chance that some of you may not have discovered it yet.
The best feature is the Today's Front Pages interactive map. Each yellow dot on the map represents a newspaper front page. Mouse over the dot and see a miniature view, as above. Click on the newspaper image and it expands so you can read the front page.
There are 727 newspapers from all over the world participating, and more are joining each day. As of today, 398 of the total are U.S. newspapers, 329 from the rest of the world. There are three papers from Iran, none from Iraq, Cuba, North Korea, or Sri Lanka.
You can't view random previous dates, but the Newseum does archive notable dates, such as Inaugural Day. If you want to read more than the front page of any newspaper, click on the website links provided.
It's a work in progress and some newspapers are more reliable than others. As with any news source, be skeptical.
Thanks to the Bibliophile Bullpen blog (no relation) for bringing this website to our attention.