I make elderberry wine every year because I can't just let the berries go to waste. It drinks heavy and it's proper headache stuff the next morning. However, it's amazing for cooking- stick some in a Bolognese or in a Bourguignon and it really does the business. My recipe isn't sophisticated, just berries and sugar and yeast.
Now rhubarb makes amazing wine. Just on its own it tastes like a dry German wine, but stick some elderflowers or orange peel in there and it picks up the flavour and gives so much back. My elderflower champagne is made of a gallon of rhubarb wine with dried elderflowers in secondary and the bottles primed with a teaspoonful of sugar. Not impressed with recipes that say you should put vinegar in with it.
Just had my first decent crop of rhubarb last year and hoping for much more next spring and summer.