Another one, for the awful beer Double Diamond:

Double Diamond Works Wonders
Works Wonders, Works Wonders
Double Diamon Works Wonders
So drink some today

(not 100% sure of the last line but it were summat like that).

Tune was "There's a hole in my bucket, dear Liza, dear Liza..."

A Watneys' Red barrel one was mentioned above. I remember one for that to the tune of Beer Barrel Polka "Roll out Red Barrel".

Any more beer jingles?