Last weekend they ran the inaugural National Marathon in Washington, DC. Most reports that I've heard about it so far indicate that it went reasonably smoothly.
I would have run it, but they had the unusual feature of having qualifying times for entrants which I couldn't meet. From the registration page at active.com (which listed an entry limit of 5000 total for the marathon and half marathon combined):
"If you are between the ages of 18-49, you must have previously completed a marathon in 4:30 OR a half-marathon in 2:10 OR a ten-miler in 1:40. If you are over 50 years of age, you must have previously completed a marathon in 5:00 OR a half-marathon in 2:25 OR a ten-miler in 1:55."
- In the marathon, there were 731 finishers, 46 (over 6%) of whom finished over 5:00. Out of that group, 25 (who supposedly had qualifying times under 4:30) were under age 50. The final finishing time was 5:43.
- In the half marathon, there were 958 finishers, 52 (over 5%) of whom finished over 2:25. Out of that group, 34 (who supposedly had qualifying times under 2:10) were under age 50. The final finishing time was 4:54.
With 1689 total finishers, it will be interesting to see if the organizers maintain the qualifying times next year when they will probably have even fewer entrants when it isn't an inaugural race.