Has anyone tried the cable crenquis mentioned usbfever Sync Blocker yet? I assume it blocks sync by shorting, but if it blocks by disconnecting the data wires, it wouldn't work for charging...?

Brando has a similar adapter, smaller and cheaper. The description says it has an on/off switch but the images clearly show that it has a toggle switch for sync/charge. I am guessing this has the same functionality as the usbfever one.

Both devices claim compatibility with the N900, but that can be for sync only for all I know. Either of these might work, but has anyone tested? I think I might order one to try.