This is a good tip for end users, but how about adding a media browser into OG? Perhaps convieniently there's a framework out there does most of the work for you, since Apple have yet to open access to the palette used in iLife/iWork -- check out
iMedia Browser.
Unlike the Apple palette, in addition to photos, audio and video, you can also insert web links.
FWIW I've requested this feature, would others be interested in seeing this?