I recently started using Quote Roller (http://www.quoteroller.com/). It bring a nice little concept of automate and streamline the proposal creation process. With Quote Roller, you can save and reuse general information about your company, terms of service and other things you used to manually put in proposals.
Making proposal using Quote Roller is very easy and handy. You just click and select options and you good to go. A professional proposal is ready to send to your client. The best part, you can send this proposal as online copy or as PDF. There is a iPhone app but I am hope they will also develop Android & Windows Phone App.
The basic account is free and I suggest try it. Let me know how it goes.The url is - http://www.quoteroller.com/