Google's offline-enabling project Gears released a version for Windows Mobile 5 and 6 devices last night, and mobile web apps like online document editor Zoho Writer and money manager Buxfer have already thrown their hats into the not-always-mobile ring. It looks like documents are read-only in Zoho at this point, but, like its desktop brother, Zoho Writer Mobile will likely upgrade to full online/offline sync soon. Similarly, Buxfer lets you check account balances and see transactions, but not make any account changes. It's a nice start, however, and more mobile apps, and functionality, are likely to follow. Visit gears.google.com from your Windows Mobile 5 or 6 device to install Gears.
Shifting Google Gears to mobile [Official Google Mobile Blog]