"Panasonic has instead included stabilization in the lenses themselves, while Olympus kept it in the camera. Apart from a few specific cases, then, you won't be able to use Olympus lenses on this Panasonic camera--which is a shame, because Panasonic's lenses aren't the cheapest."
That is completely wrong. You can use the Olympus Micro Four Thirds lenses on the GF1. You won't have image stabilization, but other than that, they work perfectly.
You can also use the regular (i.e., non-Micro) Olympus Four Thirds lenses on the GF1 is you use the special adapter that's sold separately, but autofocus is only supported with a small subset of them.