Algebraic Geometry in String Theory? I'm currently studying String Theory and hope to do research in this area. I have now reached a point where even with a background in Mathematics instead of Physics, I have no clue what's going on mathematically. 
So I've (re-)started reading up on more mathematics. This gave rise to the following question:
Is it "worth" studying Algebraic Geometry at this time? 
By "worth" it, I mean, will I benefit from this no matter what research direction in String Theory I will persue? Or is it rather specific?
(For clarification, "at this time" means I've worked my way through the book by Becker/Becker/Schwarz)
 A: I only know about string theory from a (rather great) distance, and with the perspective of a pure mathematician who has colleagues in mathematical physics who think about the theory (some of whom were trained as physicists).  
With this warning given, let me say that it seems to me that it would be near impossible to understand string theory without some understanding of algebraic geometry.  I would adopt an analytic point of view, such as in the book by Griffiths and Harris (Principles of algebraic geometry), since this is going to be closer to the language that physicists use than a more algebraic treatment.  You could also look at the books Quantum fields and strings: a course for mathematicians, by Deligne, Witten, et. al., which is based on a year long series of courses given at the IAS in 96-97, by Witten among others.  I don't know how comprehensible these will be (since they are written from the point of view of leading those with rather strong mathematical training into some kind of understanding of the physics), but they may give an idea of what kind of geometry you should learn, and what kind of perspectives on that geometry would be useful.
