Xando, I propose adding a SALARY keyword if the post includes salary, just in case the amount is in Euro or whatever.
Just a note. To have the search enabled on a salary, values have to be normalised to something, dollars sound good to me.
As for the keyword. This is something probably HN crew could decide on. In my opinion isn't needed as long salary is in first row with $xxx or $xxx-$xxx format. But since many people seems to be interested here. Maybe would be good idea to mention something about salary in the thread description.