Each site has some good stuff not on the other so it's worth keeping an eye on both. Highlights include a neat trick for expanding video format support to mkv (Matroska video) files (and in principle others) and a plugin for Flash FLV files. (Both of these require Perian.)
In the years to come I suspect we're going to look back and wonder how we ever got along without Quick Look.
Thanks to everyone who sent these in!