I LOVE Amaretto (Disaronno) in coffee. Baileys is what people gravitate to for that, and don't get me wrong, its good, but nowhere near as good as Amaretto and coffee IMO.

On the cordial/liqueur note, about a year ago I added St Germain to a typical Gin & Tonic and it really enhances the drink - the Elderflower and the botanicals in the gin combine to create a more elegant (and fragrant) version of a G&T and as a result, that's how I have been making G&Ts ever since.