I have a fairly good background in mathematics (algebra, analysis, topology, differential geometry)... and a good physics background (till QM, general relativity). I am looking to study Quantum Field Theory on my own. I do not intend to master QFT completely and all its techniques, but want to understand its general framework and move on to a String theory book as soon as I can. I tried few pages of Peskin & Schroeder and did not like it much. I have started with Weinberg's book (vol 1). I like it very much so far, but I dont think I will be able to finish till Supersymmetry (vol 3) fairly soon. And even if I do, I would not be able to remember all that I read. So, I want to leave that aside as a reference book that I can look up to, on and off, in latter years. I have looked around for a 'quick' and 'deep enough' QFT book and I think Siegel's Fields ( http://arxiv.org/abs/hep-th/9912205 ) ebook will be a good one. I want a second opinion on that and also some other suggestions (of other books). I went through Srednicki's contents and have a good feeling about that too, though I am not sure how it compares to Siegel's Fields. ps: After QFT, I am planning to start with "String Theory and M-Theory: A Modern Introduction" by Katrin Becker, et al.