Ive been using the otterbox 3600 for a couple of months now.
Have the 3600 box, CF GPS Pod, through the box cabling pod and Ram ball mount attachment.
Upsides
Its a really good solution totally waterproof and I can use the Ipaq whilst riding (not that i recomend it) and see the display easily.
Downsides
Its so bloody big.
The CF GPS Pod is not of sufficient size to accept most gps cards. make sure you check the compatabiolity matrix on the otterbox site before you go for the solution. I had to by a compatable cf card, Pharos CF iGPS, from the states and get it shipped over as I couldn't find any of the compatable ones for sale in the UK.
I currently have it mounted on the VFR using the top of the Ram mount "U - bolt" on to the tank bolts, when I get the GS (in a couple of weeks, all being well with Big Andy, then I will just use the U-bolt.
I don't seem to be able to post pics so if you want to see the set up email me and I send you some