this is a very easy one valid for any approach on a 3° descent profile:
GS x 5 = ROD
another one for flights above FL 300 and speed around M .78:
SAT = TAT - 30
and you certainly know the 1/60 rule: 1° off course results in 1NM off track after 60 NM flying
some rules of thumb are aircraft related, e.g. descent distance