I was never a user of OtherOS on any of my PS3's, never had the need since my computer does everything I need it to.
However I would like to see a dual-boot CFW that allowed for different firmware installations (if this is possible). Example, boot #1 has the 3.55 CFW, while boot #2 has the latest FW and is PSN capable. I personally think this would have the highest demand, because not all of us have separate PS3's for CFW and PSN (I do, but I still would like to have the extra option for ease of use and perhaps trophy integration between consoles).
Have no idea if this would ever be possible, but it's something that I personally would like to see in a dual-boot. Heck, why not partition off 3 sections, one for OtherOS support, one for CFW and one for PSN. That would be one heck of a CFW package!