The Casual Courier, Inc. ("TCC") is a corporation with an online forum where people with packages to send can meet casual couriers who are waiting for packages to deliver.
As of early 2014, the web site appears defunct.
The TCC process
Although anyone who accepts a package from another person for delivery during an upcoming trip is considered a casual courier, TCC developed an online forum where people with packages to send can more efficiently meet casual couriers who are awaiting packages to deliver.
Some additional features of TCC are:
References
The Casual Courier Wikipedia(Text) CC BY-SA