Here's a banana recipe I borrowed from HomeBrewTalk.
http://www.homebrewtalk.com/showthread.php?t=33636&highlight=banana
My first 1-gallon batch turned out great. I upped the ingredients to 5 gallons, which is currently bulk-aging.
Recipe Type: All Grain
Yeast: wine yeast
Yeast Starter: no
Additional Yeast or Yeast Starter: no
Batch Size (Gallons): 1
Original Gravity: 1.095
Final Gravity: .990
Boiling Time (Minutes): 2
Color: WHITE
Primary Fermentation (# of Days & Temp): 1 week
Secondary Fermentation (# of Days & Temp): Until finished
BANANA WINE (2) [Heavy Bodied]
3-1/2 lb. bananas
1 lb. chopped golden raisins
2 lb. granulated sugar
1-1/4 tsp. acid blend
1 tsp. pectic enzyme
1/4 tsp. grape tannin
1 gallon water
wine yeast and nutrient
Slice bananas into thin discs, leaving skins on fruit. Put into grain-bag, tie top, and place in 6 pints water. Bring to boil, reduce heat, and simmer for 30 minutes. Remove grain-bag to bowl to catch drippings while pouring liquor over sugar in primary fermentation vessel and stirring well to dissolve sugar. Add acid blend, pectic enzyme and tannin, stirring again. When grain-bag cools, squeeze to extract as much liquid as possible and add liquid and drippings to liquor, discarding pulp. When liquor cools to 70 degrees fahrenheit, add yeast and nutrient. Cover and set in warm place for seven days, stirring daily. Pour into secondary fermentation vessel, fit airlock, and move to cooler place, leaving undisturbed for two months. Siphon off sediment, add chopped raisins, and add water to bring to one gallon. Ferment another four months. Rack and allow to clear. Rack again and bottle. May taste after six months, but matures at two years. [Adapted from passed-on recipe, source unknown, taken from Jack Keller's site]