No real order to these ... just sharing some info I've found out:
Indiana (Kelley) -- they've been offering online MBAs since 1999, making them the longest running online MBA offered by a top 25 program. The lowest cost and the highest scholarship opportunities of the other three. Require two week-long trips to campus for class during the program. Average GMAT for online students is around 640, the GPA is around 3.45 and the work experience is 9.0 years.
Michigan (Ross) -- they've only been accepting students for one or two years, making them the newest top 25 program to start an online option. No ideas yet on scholarships; cost is middle of the road vs. the other two below. Require three visit to campus during the time in the program. Average GMAT for online students is 665, the GPA is around 3.40 and the work experience is 7.6 years.
Carnegie Mellon (Tepper) -- they have more requirements to come to the campus for class time than the other programs listed here, so if you're not ready to spend the $$ and time to travel to Pittsburgh (or their Silicon Valley campus), you should look elsewhere. My estimate is that 15% of the program is required to be taken AT Carnegie Mellon (and 85% at home). No ideas yet on caps on scholarships; they're the most expensive tuition of the other three programs. The average GMAT is 670, the GPA is 3.40, and work experience is 6.4 years.
North Carolina (Kenan-Flagler) -- they've been offering an oneline MBA for nine years (if I remember correctly), and are currently graduating more students through their online portal than the other three (again, if I remember correctly) -- so, they're catching up with Kelley's lead in 'total students graduated since inception' stat. Scholarships cap out at around $10-15k ... or about 8% of the total tuition cost. Approximately 5% of the program is required to be taken in North Carolina. The average GMAT is 661, the GPA is 3.30, and work experience is 10.0 years.
... USC (Marshall) and Arizona State (Carey) are the only other schools in US News & World Report's top 40 to also offer an online MBA program ... but, I've not heard anything too enticing about either (other than ASU is the cheapest of the six and the easiest to get into of the six), so, if you're interested in either of them, you'll have to dig it up yourself.