iVl from the Mac App Store. Best $3.99 I've ever spent. Tags, titles, and movies to iTunes automatically. Quality is great on everything I've encoded so far. I've encoded just about any format I've downloaded (avi, mkv, m2ts).
I have been using iFlicks, fantastic program. It's got all of the presets for apple formats, it also adds the metadata and sends the finished file to itunes.