My favorite use of the Angostura is with the Suffering Bastard. Have you had one? For me, it's my favorite "hair-of-the-dog" hangover drink. So much more enjoyable than a screwdriver or bloody mary.
In a shaker, put:
1 oz gin.
1 oz Brandy.
Half oz lime cordial.
3 or 4 dashes of the Angostura. Careful with this shit; it stains like a motherfucker!
3 or 4 big ice cubes.
Pour into a short glass, and top with about 4 ounces of ginger beer. Don't mess around with ginger...