rexman,
Concrete: I have been studying chapter 29 of the PCA Notes on the ACI 318-08. I also have been using the SEAOC Volume 3 for special moment frame and special shearwall seismic design. I'm only done with the specially reinforced concrete walls. I would never have known that you can assume all tension bars are yielded unless I studied (ie ordinary walls are actually more complicated in my opinion because the stress strain compatibility solution would take forever). Moment frames have those annoying stirrup, closed hoop requirements that I'm still not quite comfortable with... studying this currently. PCA Notes: $110+/-
Steel: AISC Seismic Design Manual is absolutely essential for me. The SEAOC volume 3 which also has concrete seismic is good for the concrete stuff, but has a lot of comments of what to do in practice for steel design and flat out says in places that it goes beyond what the Seismic Design Manual does. $175+SEAOC($67) = approx. $240.
Masonry: I'm using James Armren's Reinforced Masonry Engineering Handbook, 6th edition. The one thing I don't like about Ahrmren's book is that he references his own tables in his appendix and sometimes engineers just need a quick reference to understand the topic. I like Ahrmren's book though because it is all inclusive whereas the Masonry Designer's Guide is more scattered and doesn't dig into the detailing as well as the Masonry Engineering Handbook noted above. Armrhen has also been the king of masonry research and publications, but he's nearly retired and probably won't publish a 7th edition (hand off the baton to another author?). $100+/-
Wood: I'm not sure how specialized wood design can be, but I was able to complete wood design using the Kaplan Structural Engineering Practice Problems. The diaphragm issues and finding a collector/chord force anywhere along a load path is covered very well in this book. $100+/-
I'm from Oregon, and since moving here from the midwest (I passed the PE in 2006 - my first year in Oregon), I have learned 10 fold on seismic as it relates to steel and wood... hopefully enough to pass on concrete and masonry.