I'm currently reading through Weinberg's the Quantum Theory of Fields in a reading group, and this page is my repository for some notes, solutions, and related Mathematica Notebooks. These are really meant mostly as a personal aid in understanding the material, and as a reference for my future self (as an alternative to my chicken-scratch notes). If these help other people, that's cool too.
These solutions are a work in progress as we read through the book. I don't think I've seen a complete solution set posted anywhere, so our goal is to fill in the gaps, as well as offer more detail to the solutions currently out there. The current solution sets I've seen are Ray Hagimoto et al's and Jimmy Qin's.