Many SharePoint Partners have been working with SharePoint 2010 for over a year and many of those have started to announce which solutions they will have ready at the time of launch or soon after the launch of SharePoint 2010.  

Announcing – the SharePoint 2010 Solution Gallery

http://sharepoint.microsoft.com/SolutionGallery

SharePoint is the Business Collaboration Platform for Enterprise and the Internet.

The SharePoint 2010 platform is enabling more partners than ever to rapidly deliver their solutions with enhanced capabilities for SharePoint customers. Partner-provided solutions are designed to solve the challenges that organizations face as they convert business process to SharePoint. SharePoint ISV Partners build solutions that Connect to, Extend, or Build On SharePoint.

This listing of SharePoint ISV solutions consists of a few of the partners that have announced they plan to support the SharePoint 2010 platform.

Please review the solution gallery and contact partners directly for information about their availability dates and possible beta programs.

For a full listing of SharePoint partner solutions for all SharePoint versions, see http://pinpoint.microsoft.com

If you are an ISV and would like to learn about migrating your solution to the SharePoint 2010 platform, see http://frontrunner.msdev.com/whyjoin/sharepoint2010.aspx.