I was also using Astrid with Producteev but have switched to Springpad. This keeps my notes, to-do lists, etc. synced between my EE, PE, and PC and even has an offline mode for Chrome. http://www.springpadit.com

Another very useful tool to keep data in sync is Syncness which can be found on the Amazon market. This allows you to sync to a NAS (or PC) so I have folders set up on my NAS that I want to appear on both my PE and EE and it keeps them in sync!