What I have done here is take a 4 port USB 2.0 HUB and replaced it's non-OTG Male-A cable with an OTG mini-B. It is a sweet N800 USB hub now. I just plug it in and N800 OS2008 host mode is triggered. I can plug in all sorts of USB devices, which work.

I have successfully used this set-up (see photos) with SanDisk Cruser memory stick/jump drive, a USB Compact Flash, Smart Media, MMC reader, a USB keyboard. Note: Each device worked in the hub fine (without power) so long as the N800 wasn't asked for too much juice. To use the keyboard, USB card reader and Cruzer jump drive simultaneously the hub needed to be powered using the supply in the photos.