Try to remember a dream sign. One that that I used, was the theory that letters look like jumbled/hieroglyphics, and are changing always in dreams. So I looked at a book shelf in my dream, and noticed that the letters were almost alive. This was a conscious memory of what I was reading at the time, brought over into the LD. My memory was crystal clear. I pratice a great memory trick in reality, and I think meditation helps the memory as well. The below trick is great if you're an avid reader. And if you want to learn a dream recall mantra that's good, vist my thread: newbe lucid dreamjournal at the Introductory Zone.

Memory trick:
When learning a new word:
Step 1. Say the word 5 times with the meaning.
Step 2. Look away to the left or right, and say a completly different word once with the meaning.
Step 3. Bring your gaze back to center, and say the original word you're trying to remember one more time with the meaning.

What this trick does, is allow you to plant a short term memory into your long term memory, with easy recall. This trick is allmost 99% perfect (although some words I have trouble with), and I've increased my vocabulary 10 fold, not to mention it's great for remembering proverbs, and theories as well. Developing an illustrious memory in reality may help in the lucid dream realm. Good luck with your recall.

Example: Prophetic (to predict the future)
Prophetic (to predict the future)
Prophetic (to predict the future)
Prophetic (to predict the future)
Prophetic (to predict the future)
Turn your gaze to right or left
Lucid Dream (to be awake in your dream)
Turn your gaze back to center
Prophetic (to predict the future)