Excelsior and Deaconess are the two big online nursing programs that I can think of. I don't know much about Deaconess, as I haven't researched them much, but I've done a lot of looking into Excelsior.
The general feeling I get on Excelsior is to stay away from it, unless you have no other choice. The program is regionally accredited, and is 100% legit. However, a few states don't recognize Excelsior grads and will not license them (California is the biggie, since that's where the good majority of nursing jobs are right now). Also, I've read a lot of horror stories on the CPNE (basically, the lab/exam final at the end of the program). It doesn't seem like it's worth the investment.
This has lead me to just forget about online ADN programs altogether. I will most likely go to Excelsior to pick up my BSN, however. But, I'll be getting my ADN at the local community college after I get my LPN (despite the fact that I've heard it's a very unorganized program).