personal library

I feel like I learned a lot from Daniels, as well as from the books by Pfitzinger and Douglas.  For cycling, I feel that I learned a lot from the books by Ed Burke (especially Serious Cycling and High-tech Cycling).  Those are just a few authors to consider, IMHO.  Swimming, I just trust my coach -- I've never read TI stuff, just some unmemorable things from the library.

I tend to read lots of scholarly articles too, but their applicability to actual training can often be hard to work out -- I just like to read them.  As I work at a major university, it is easy for me to get access to them.  Otherwise, that can be a little difficult, as the publishers tend to want to charge unconscionable prices to read them online, and many libraries are dropping their printed subscriptions to these journals.

x2

Training For Endurance
by Phil Maffetone

this is the only book i've ever purchased that was focused on triathlon.  It helped me a TON my first year.

Swim Bike Run