To greatly increase your dream recall, do this:
Before you go to sleep, take a bit of paper ( loose, or in a journal, whatever ) and write the line "I always remember my dreams". Where you write it isn't the point, it's the act of writing it that matters. Don't do it on the computer, do it long hand with an actual writing implement. Write this 5 times. Then put it aside and go to sleep.
When you wake up, whenever you wake up, jot down some keywords about the dream you just had, the one that's evaporating. Even if it's just one keyword, it will help. Go back to sleep.
When you wake up in the morning ( after your alarm, or whatnot ) do the same thing... jot down some keywords. As many as you can. Keywords are beter than writing out whole passages of dream-recall, because just the keyword read later can open up huge bits of memory, and keywords are much easier/quicker to write down. Plus the act of deciding on a keyword helps to encode the memory in a more accessible place.
During the day, look at your keywords. Try to recall the dreams.
Do this for a few days. If you hardly ever remember your dreams now, doing these few things regularly should send your recall off the charts. The more you do these things, the better your recall will get. It's like exercise.