PocketPC with Windows Mobile 6 installed can now rejoice! Microsoft has announced the launch of Windows Mobile 6.1 officially! Windows Mobile 6.1 offers a more stable OS, new IE features such as zooming capabilities when browsing pages, built-in task manager, updates to Windows Live search, and also threaded SMS messaging (conversation)!
A video on Windows Mobile 6.1
Official ROM updates should be underway now and available at Q2 2008 (fingers crossed).
If you don’t want to wait or can’t wait, there are unofficial Windows Mobile 6.1 ROMS lingering around @xda developers forum that you can download and install. However, use them at your own risk!
Source: Microsoft Press Release