The mobile internet is evolving fast and it will be of a similar importance as the web. This gives reason to become aware of the preconditions to develop mobile internet services. A primary problem in this market is the variety of devices, which is characterized by different pre installed programs and various display formats.

mobiForge is a recommendable mobile development source. This site delivers up to date information and includes developer forums, testing tools and directories. Another service of mobiForge is the DeviceAtlas, a database of mobile device data.

In the following there are a couple of articles about the up to date happenings at the mobile internet:

Strategies to develop mobile internet services regarding various display formats
mobiForge: Effective Design for Multiple Screen Sizes

Competition in the mobile advertising market
MediaPost: Mobi War: Ad Nets Competition Heats Up

New providers of mobile payment systems. Online payment is a topic of the next update of the directory, which, too, includes a couple of new mobile payment services. Further information will be available within the next days at this blog.
Cnet News: Here come the mobile payment wars

Directory Sources: Mobile Internet - Mobile Marketing