You have to wonder what the camera companies are thinking sometimes. Take a very simple question I was trying to answer yesterday: which 4/3 lenses are fully functional on a m4/3 camera? Seems like a simple enough question. Seems like the camera companies ought to know that answer. So let's go to their Web sites.
Panasonic actually has a chart for this. Actually, charts, since the recently announced G2 and G10 are different. But take a look at that chart. It amuses me no end. All the Panasonic lenses are identified by model number (you know the model number of your lens, right?). Apparently the Panasonic employee putting together the chart didn't have the model numbers of the Olympus lenses handy, so they referred to them the same way you and I would look for them: by focal length and aperture. Fortunately, focal lengths are buried in the Panasonic model numbers (H-F007014 is the 7-14mm f/4, for example), so you can muddle your way through the chart. Still, I find it ironic that Panasonic couldn't put two and two together and figure out that we don't look for our lenses by model number. Panasonic gets an A for effort, C- for execution.
The Olympus chart is difficult to find. It's on the Japanese site. The Olympus chart is a bit confusing, and it takes a moment to decipher it. First, CDAF isn't supported ("...the camera operates as in S-AF mode"). Second most of the lenses have a footnote about preferring S-AF+MF mode, probably due to the slow speed at which these lenses autofocus on the m4/3 bodies. Here I'll give a C for effort (really, only on the Japanese site?) and a C for execution (the English needs a fair amount of rework).