FF (Fertility Friend) isn't really all that confusing, and I find I like the chart there (I can't find it on mymonthlycycles except if you have a premium account) and the calendar. I'll see how much I like it when the free VIP trial runs out.
Both work very similar...I actually like that on FF you can enter everything from one area (tabbed in my case) rather than having different sections that you have to save in one and go out to anther as in mymonthlycycles. But, it's all up to you. You have to be comfortable with whatever you are using.
As for being fertile the day after you O...yes, the egg doesn't die within hours...not to sure of the technical stuff, but I think the egg stays around for ummm....24 hours?.....after it's released and it if it's not fertilized then AF comes and cleans out your body to be ready for the next month. Feel free to correct me if I am wrong on anything here! I won't be insulted or upset or anything. I'll just be saying

to myself that I was so out in left field...
