Here are some useful websites for PEM-related learning, this list is by no means exhaustive and continues to grow...
Don't Forget the Bubbles (blog)
Genetic Syndromes (a useful table reminder of commonly encountered genetic syndromes from DFTB)
PEM EM Morsels (blog)
Spotting the Sick Child
Resus.me (blog dedicated to latest evidence)
Life in the Fast Lane (access to blogs, calculators, guidelines)
EMPEM (useful podcast on latest evidence)