Use case is that a user gets an order email with a tracking number.

Instead of having to copy/paste the number in a tweet or website, the user just fowards the email to "new@usetrackthis.com".

TrackThis knows the inbound email address and uses the preset preferences for tracking (RSS, tweets, email, etc) set by the user.

This is how TripIt.com works (http://bit.ly/nWGl).

(packagemapping.com uses the Google Maps API very well to show the progress of a package.)

It'd be great to integrate the maps into the UI on the site, and even more convenient for the user to include a "screenshot" of the map in the RSS Feed or email.

Add a way to link this account to my Amazon (an possibly other accounts) to automatically check for new packages being sent and add them to the packages I'm tracking.

just have it in the body of tghe message.

This way we don't have to rely on the header to find out what time the package was delivered - say a mobile user had no reception.

https://www.ontrac.com/

Please extend the session time so I can stay logged in (all the time?)

I'd love a way to look back at older packages weeks after they have been delivered. It is very nice to have a master list of all your incoming and outgoing packages so that you have a record.

The entire transit history probably isn't required, but being able to look back at the delivery dates would be great!

It would be super-nifty if I could somehow add a Package for tracking straight from my Gmail.

There needs to be an option not to receive a SMS between certain times.... got woke up twice lastnight.

Great service. I wonder if it would be possible to use IM (AOL, GoogleTalk, MSN, etc.) to get package tracking information.....

Add LASERSHIP service, Amazon uses it a lot I guess a lot of people will appreciate it

A Canadian shipping company. Probably the best Canada offers, would love to see it supported.
http://www.purolator.com/

It would be nice to be able to sort the packages being tracked by description or tracking number so they aren't in a different spot on the page every time I visit.

I would appreciate to see DHL Tracking for Germany.

http://www.us.chronopost.com/web/en/

This would allow us to track packages sent via the national post service.

it's available on Hong Kong post site
the tracking usually goes till HongKong Border - but at least it's will be possible to know when it happened .

http://www.hongkongpost.com/eng/tracking/index.htm

it would be great if you could add the feature to track Royal Mail Special Delivery items (RMSD).

http://www.royalmail.com/portal/rm/jump2?catId=400028&mediaId=400026