Nokia never made a USB desktop cradle for the N900. The closest thing from Nokia is the now discontinued DT-13. Brando has released two very interesting solutions for the lack of a proper desktop stand. The first model, the 8500 syncs your N900 using the built-in USB connection and charges the battery in the process.

The second option is basically the same thing, but adds a place to charge a second battery. That last model, the 8600, cost $6 more, but the option to charge a second battery seems well worth the extra.

Both of these cradles seem  a bit plasticky to us, but overall quality seems to be good. Have seen any cool desktop cradles for the N900, let us know.