Remember the Milk's task management webapp is streamlining its methods for giving tasks due dates, priorities, locations, tags, and other features with a new Smart Add system, and made a few pretty smart tweaks to its web interface as well.
Smart Add isn't one big new feature, other than a now ever-present task addition box on every page of the webapp's site. What Smart Add does is remove uncertainties about whether RTM will pick up your context when typing in something like "Return drill to Dave at 9am Thursday". You can still use that kind of context, but Smart Add now reads for special ASCII characters and codes the text after them into the proper spot. The most convenient part is that it works from every RTM interface—emailed or Twitter direct message, the RTM iPhone app, and it's open in third-party APIs for use in those systems as well.
So if you wanted to enter a very specific "Return drill to Dave at 9am Thursday," you could send it like this now:
Return drill to Dave ^thursday #personal #car =20min
That would set up "Return drill to Dave" as a task due on Thursday, in your Personal list with the "car" tag, and estimated to take about 20 minutes to complete. Having to learn another kind of language for task management might not appeal to casual users, but for power users, it's probably worth the small investment in learning which shift-characters correspond to which tasks.
Hit the link for the full read on how Smart Add can be used, along with descriptions of some other webapp tweaks, and tell us what you think of Smart Add's new command-line-ish powers in the comments.
Introducing Smart Add: a smarter way to add your tasks [Remember the Milk Blog]