Jason:
Below is the regular (common) version of the Rizzuto/Yankees Pennant.
Also a much less common version, with blue fringe instead of tassels.
DWR:
Below is another cool earlier Dodgers Banner (from Jackie's Rookie Season...)
Rob:
Below is the Giants Pennant that I most regret selling. It's really rare, and is from Willie Mays' time as a New York Giant. I thought I might see another one turn up, but that's not been the case.
Still feeling the remorse, but it went to a great collector with impeccable taste. He specializes in 1950s "Player Pennants", so it found it's proper home. This is the example pictured on the cover of Mike's Pennant Price Guide. I'm curious if you have this one, as it's about the only Giants Pennant I didn't see pictured in your wonderful collection.
I'll throw in one more Giants Pennant below... I sold this one 3-4 years ago, and haven't seen another with multi-color graphics. I believe this one to be to be fairly rare, too.