To Do List is a simple & powerful extension for helping you to manage your day-to-day tasks. It is clean, elegant and unobtrusive.
It's updated regularly so if you have any suggestions let me know.
Update 23 June 2015:
I have several updates in the pipeline for this, but they won't be applied for a while due to technical issues. Bear with me.
谷歌浏览器、其他Chromium内核的浏览器