Yahoo Go: A service designed to let consumers take Yahoo internet content and services with them on their mobile devices. Consumers can now access their Yahoo services such as email, messaging, address book and calendar applications on their PC, mobile device or TV.
	Yahoo SMS (short message service) Search: Enables mobile consumers to interact with search-related information. The information available includes local businesses, weather reports, stock quotes and more. Yahoo SMS Search works when a consumer sends a shortcut search term text message to Yahoo (92466). A text message response will be sent to the consumer's phone with the search results.

Other players include
Carriers:
Verizon, Sprint, T-Mobile

TV/Cable Networks:
ABC, MTV, et cetera

Search Engines:
Google, MSN, AOL

What it could mean for marketers
The big marketing take-away for Yahoo's mobile presence is that it's another (increasingly popular) platform that allows users to access Yahoo content wherever they are. Ensuring that you're prominent within Yahoo's standard searches should enable you to appear amongst on-the-go searches.

Consider building an SMS bot that consumers can use at the point of decision. Imagine a consumer shopping at a mall, deciding where to buy your brand's shoes. They send a message using your SMS bot to find out if they can get a better deal on your brand of shoes somewhere else. Your SMS bot tells them that there's indeed a better deal on your shoes-- at the shoe store around the corner or somewhere online.