Wayne uses Evernote a lot. A number of 90 Minders do. Chuck use MS OneNote for now. We've liked it because it is intuitive to use and easily mimic physical notebooks, sections, tabs and pages. It does sync between the devices we use.
I've been tempted to switch to Evernote because it looks like the world is sliding that way, But I've resisted mainly because I really, really like the OneNote's Notebook:Section Group:Section:Page structure.
Now I have to rethink my fear of change. DO look up Charlie Rose's show of llast night (http://bit.ly/19SQhQU). The CEO of Evernote laid out a remarkable vision of where they want to take Evernote: make it ""your external brain."" It goes beyond just recording stuff as you do in a paper notebook.