Marketplace will reach 30 million devices

Microsoft has recently announced that Windows Marketplace for Mobile will be available for all Windows Mobile 6xx versions. For devices with 6.0 and 6.1 a download will be available by the of this year.
Therefore developers will be able to reach a wider audience when trying to sell their products.
Here is the timeline:
Application Submission Opens on July 27th: Windows Marketplace will open for application submissions from 29 supported countries July 27.
Windows Mobile 6.0 and 6.1 Support: Windows Marketplace will be available for Windows Mobile 6.0 and 6.1 by the end of 2009 (in addition to Windows Mobile 6.5 at launch in the fall).
Business Center: Windows Marketplace will feature a "Business Center" category for business applications.
Developer Contest: Microsoft will be disclosing the details of a Windows Marketplace developer contest on July 27.
Source: Windows Mobile Blog