The Wall Street Journal is reporting today that UPS is entering the web-to-print market.

UPS is rolling out marketing Monday to highlight a push into Web-based printing, in which clients can send documents such as business presentations to UPS retail stores via the Internet to have printed copies made. FedEx already offers online printing at its FedEx Office/Kinko's locations.

The move is already causing a stir among UPS customers who will now see their vendor as a competitor. I noticed this tweet this morning talking about the move:
We ship a lot of packages via UPS. Now I see where UPS has entered the web-to-print biz. Another vendor is now our competitor. #Print09

UPS has released an official announcement: The UPS Store Now Nation's Largest Online Printing Network