I use vimwiki for most things (in Dropbox), you can keep todo lists etc. in there. I'm moving towards a per-project wiki as well. I built a horrible hacky android app which hooks into any of the "sharing" menus which just appends a link into my wiki, so that's quite handy.

For email, I've really been enjoying Google Inbox, the ability to sleep items is nice, and the reminder function is quite a handy TODO list of sorts.

But mainly it's the vimwiki for me.