I may get myself into BIG trouble on this, but I want to fit the OPs need, too. I went to B-school on the west coast at a similarly rated school to some of those mentioned, my bachelors' and most of my master's, who now, like many, offer excellent programs online. They are very do-able for one who works since many discovered the internet since I was in school in the typewriter days.
There are also some Eastern online B-schools that have more prestige, but can never be done by a person who both works and does online school. Not only is it far more expensive, and that this school(s) I researched may have more nobel prize winners and top authors than all the west coast B-schools combined, but don't do them because while they say you can do them while working, you would not sleep for the next two to four years (as these are PT programs wanting your money). They're called NYU, among a few others, and they advertise heavily. For that school, they are not the easiest school and they may pull themselves off as the "workingman's non-Ivy", but their rankings in their grad schools show otherwise. A school like NYU and some Ivies don't top the grad school rankings list by being easy, especially while still working, so buyer beware. I just wanted to let you know early before you start seeing all their ads. And yes, the Ivies also have, belatedly, jumped on the online band wagon in graduate education.
Now if you plan to go to B-school full time (MBA, MS, MAcc, MPA, MSTax, MA quantitative analysis/business stats, and many other B-school related majors), then NYU and Harvard are great choices, and perhaps the best online US choices that I have heard about. Anyway, check out Bear's guide to online colleges, and they have a write up on Harvard. As for NYU,
www.scps.nyu.edu .Those are the best online examples I know about domestically. University of London is a great "international" school and I was an exchange student there. But don't expect them to be easier than American NYU type schools. Be prepared to smash the GMAT though if you shoot for top Eastern B-schools or top international B-schools.
But what makes the most sense, if you are going to work, is get that regionally accredited MBA as that is your cake as the regionally accrediting agencies are the only standard that an employer will care about, and nobel prize winners on faculty, former Fed Chairmen on the faculty, AASCB status, US department of Education status, awards for online education excellence write ups in the Wall Street Journal, Gourman Report rankings, and Business Week rankings are only the icing on the cake. And the whole "bakery" is what you do with the degree, bachelor's or master's. I have met plenty of MBAs out of work who have some excuse that so and so had a Nobel and was their advisor, or that Professor so and so writes widely used textbooks, or that their school produced more CEOs in the fortune 500 than any other school. What is key is that you have a job, and then way down the list after that, is that you get that MBA.