Don't know of any website. PGY just means postgraduate year (i.e. after medschool), so a PGY 1 is just an intern, PGY 2 is a 2nd yr resident, etc. Categorical just means a resident that is scheduled to complete the training necessary to become certified by the american college of whatever specialty (ie sit for the boards) while prelims are just completing a set number of years prior to entering their desired field (i.e surg subspecialties do a year of general surgery before starting ortho, urology, ent, etc). I know this is explained somewhat in the surg forum under Q & A. It can be confusing.....hope this helps some.
