A summary of detailed measurements of the field and temperature dependence of the ac susceptibility, magnetization and the longitudinal and transverse magnetoresistivities of ceramic La_0.67Pb_0.33MnO₃ is presented. Detailed analysis of the magnetic data provides an estimate of 340.5±0.5 K for the paramagnetic to ferromagnetic transition temperature T_c, with the data closest to the critical point yielding = 1.39±0.06 (from the temperature dependence of the susceptibility along the crossover line), = 0.41±0.02 (from the field induced variation of the temperature of the same line) and = 4.20±0.15 (from the field dependence of the critical isotherm). Nevertheless the presence of disorder - a variance in the distribution of spin-spin coupling strengths - means that Heisenberg model (asymptotic) exponents cannot be excluded; the universality class for this system cannot therefore be definitively identified. The transport data yield T_c = 339.6±0.4 K, and while the isotropic magnetoresistance peaks near T_c, as expected, the magnitude of the spontaneous resistive anisotropy (SRA) (the difference between the longitudinal and transverse magnetoresistance extrapolated to zero induction) increases linearly with decreasing temperature below T_c, peaks near 30 K and then falls to a smaller value (-0.2±0.03%) in the liquid helium range. While this latter value is in reasonable agreement with itinerant model predictions, the temperature variation in the SRA above 30 K is more convincingly reproduced by a localized model. Furthermore, the mechanisms controlling the isotropic magnetoresistance and the SRA in this system appear to be different.