I don't know exactly how much it will boost your scores, but yes.. the more you get that credit card down the more your score will go up. 50% is better than what it may be now... but it would still be very high utilization. I know it should go without saying but make sure your credit reports are the best they can be in regards to eliminating or improving what's already on them for other accounts. Every bit helps.
There are a few really good morgage people around that can help you further with the refi details. Also, as far as your upcoming emergency fund plan... hsbcdirect.com has a great online one... one of the top yields. FWIW, opening an account and throwing in just $10-20 bucks might give you a mental boost... and it will be there when you are ready to pad it down the line.
EQ 787 EX 781 TU 737 11/17/07
*** I am not an attorney. If I was, I might not clip coupons. If you want legal advice, consult an attorney. If you want my personal opinion, feel free to consider my posts***