The fact that iPhoto, even the latest and shiniest '06 version, doesn't allow access to a camera's storage card to pick and chose which images get imported has irked users across this great planet of ours for years - until now. macosxhints has discovered
that striking the return key twice when the import screen is displayed (upon connecting a camera or card) will enter users into a manual browsing mode, allowing them to browse their images directly from the device, the way it was meant to be (at least as an option; I'd bet this is yet another undocumented feature).
The original hint poster stated that they couldn't manually move images over; he/she could only browse them. Rob Griffiths, however, added that he could in fact manually import a custom selection of photos, suggesting that this might work on a per-camera basis. He requests, and I echo, that users who try this out post their camera model and experience over at macosxhints so they can get a good list of working models.