Looking for web task list software that one can point to with URLs

[Chris G]

This isn't specifically Ubuntu but it'll probably use a LAMP server so
near enough.

I'm looking for a web (e.g. PHP probably) based Task List or Todo
application where one can set up links from other web pages to point
to the tasks in the Task List.

For example I set up a ToDo entry that says I need to get the car
serviced in June 2010.  Then in my car blog or journal I put an entry
in that is a link to the ToDO so that whn I click on it up pop the
details for the requirement (e.g. exact date, importance, etc. etc.).

Can anyone suggest a tool for doing something like this?

-- 
Chris Green