You need to be a little more specific regarding your interests and background. If you are interested in theory, there are plenty of books discussing specific models. However, most practical or buzzword (e.g. HFT) books are rubbish (think about it: if you have a profitable operation, why would you write a book? Unless, like me, you have a screw loose :P ) If you want some practical discussions, "Trading and Exchanges"…
John Hull is canon. Read it, live it, love it, keep it under your pillow. It is truly superb. Nassim Taleb's "Dynamic Hedging" is the finest book I'm aware of on the subject of actually trading/managing vol portfolios. It's REALLY good. And dense. "Paul Wilmott on Quantitative Finance" vol 1-3 are worth having as a reference, perhaps.
"Analysis and Use of Financial Statements" by White, Sondhi and Fried.
It has nothing to do with computational finance but knowing more than nothing about financial statements and how to think about what a company actually IS can only help you in the long run. Also, it's quite interesting.