Hey Matt,
I have watched a lot of pole vault videos and have learned something from all of them. The old Jan Johnson Skyjumpers videos are classic if you can get your hands on them, in addition to the ones Becca recommended. Basically, watching good vaulters (both male and female) is good practice for the visualization that superpipe mentioned, and he has posted some great clips to study in detail, while comparing to your own vaults. Go frame-by-frame and try to achieve the positions you see on these videos in your drills and training, starting from the first step of the run. Stabhochsprung.com has a lot of clips to study as well. Make sure you are getting video of your own practices, drills included, and always strive to improve (treat drills as a competition). Seeing what you are doing in slow motion is always important feedback. I am sure you are doing this already!
Definitely buy BTB2 and the DVD...I do not know of another book with such detail about the event, it is basically the textbook of pole vaulting. One of the great things about the DVD is that there are several of Bubka's, Isinbayeva's and other athletes best jumps broken down in detail with stop-motion at all the key positions. I have read the book many times, also managed to watch the DVD quite a few times and still find it useful, but the music is god-awful (sorry Altius and Neovault...but hey at least I gave you a plug)
I hear Rick has a "little book" that you should ask him for next time you see him. His DVD's are also very good, you can find them on Youtube I believe or get them from him directly (maybe he will cut you a deal,

). I have his "ground work" video that covers much of what you did at the symposium, you can borrow it sometime if you want to check it out.
If you haven't seen it already, David Butler has a good clip of a lecture from the PV Summit. You can probably find a link by searching this site. Also, Spencer Chang's article he posted on this website a while back really lays it out well, try searching for that also.
All of the people I mentioned above deserve credit for sharing information about the pole vault.
Hope you've gotten some vaulting in with the nice weather
Take care,
Tom