It's a good job I had a look at the resources! I was just about to post this very site in as a good resource.
At first glance it might seem this is a site for beginners, but it's not really. Vanilla chords are only good so far as they go and beginners wouldn't know what to do with them.
For beginners who want to know the accepted progressions for tunes I'd say get a Real Book.
For those with more experience of reharmonisation this site is very good. Even for them, however, you wouldn't necessarily know how many of these tunes are played professionally.