20 Jan
2010
20 Jan
'10
5:11 p.m.
This sounds very much like Google Notebook, with the firefox extension, to me.
It's no longer being developed, but I believe the service/extension might still exist. Failing that, I believe zoho notebook does the same sort of thing, but I haven't used that.
These are not tickable task lists per se, but like other web utilities, can probably be used as such as long as you have that prompt.