Modifiers for Off Camera Flash

I found my old Lastolite Micro Apollo 45 softbox buried under a stack of competition prints today. I bought it for on camera flash use intially, but started using the Stofen Omnibounce instead for size (not that I can find it anymore!). It got me to thinking about modifiers other than the humble umbrella. So I popped along to the Strobist Flickr Group and popped the question.
Almost immediately Kev Yong pointed me at to a site talking about Nikon SB800 modifiers. Although I shoot Canon, the modifiers still apply to Canon flashes also. My intention is, of course, for Off Camera flash now, so softbox sizes well in excess of the 8X5.5" Micro Apollo are now longer an issue.