Nice point. Yet...

What about "references"? int& a, b; or int &a, &b; ?

So, I think that I'll stick to int* pa; int* pb;

i.e. one variable per line.

Additionnaly it makes it easier too lookup for a variable's type when reading the source code because one does not need to walk thru a list to find the variable, it is always after the type. I actually use "auto" to make it even easier to find variable declarations, going as far as grouping such declarations to some extend to make them easier to find.

Styles vary.