Trello for long-horizon planning; it’s great for annual planning and for multi-step projects like communication plans and for publication planning.
ToodleDo is task manager that lets you hide future to-dos so that you can focus on today’s tasks.
I tried using Evernote a long time ago and it never really clicked, but now I am a convert. The web page clipper is a game changer for capturing and organizing project resources, research and reading lists.
For collaborating on documents, nothing beats Google Docs.
For cloud-based file storage and file sharing, Dropbox is easy and intuitive. Dropbox also makes it easy to share large documents without filling up your colleagues’ inboxes.