Thanks, I had no idea it didn't matter which IRA it came out of, I've been doing it proportionately, as that's what Fidelity reports to me and that's what they will do for you automatically.
So to clarify, Fidelity DOES let you withdraw proportionally from all positions (e.g., Google is 40% of an account and Facebook is the other 60%, your RMD for the year is $10K, it would sell $4K of Google stock and $6K of Facebook stock for you). I have it set up that way, and I have 25% tax withheld for my own convenience. I don't like feeling like I have MORE money than I do...actually, I like it the other way around! If I don't feel like I have much, I don't spend as much.
Anyway, you can also have it automatically sent to another account, or you can have a check mailed to you, both of which I've done. I have had trouble getting it automatically transferred to another bank, but I have a Fidelity taxable investment account that has my other bank linked, and so I just have the RMD sent to the taxable account, where I can transfer it easily.
Note: unfortunately for me (in a personal rather than financial sense), these are both inherited IRAs, but while some things may be different (I have RMDs yet I'm only in my 40s), I don't think the account features are any different, though. I've been very pleased with Fidelity, they generally make things easy to do online, with a few exceptions, but fewer than any other bank/brokerage I've used.