I've tried several times to move my personal organization system to Remember the Milk, because it has rich support for three features I really like:
- keyboard: just about every field has a keyboard shortcut, which makes entry and maintenance very efficient
- tags: clearly visible, clickable, and there's a separate management screen
- searches: mix and match most attributes, boolean operators, and save favorite searches
Unfortunately, the web-app has been all but abandoned, going without even bug fixes. Is there another application that has these features, either on Linux (perfect!) or the web (acceptable)?
[EDITED TO ADD]: Web-app recommendations also need to include two-factor authentication that doesn't require a smartphone. I apologize for not including this in the original post, but it didn't occur to me that this would still be an issue in mid-2015. :/