Now I'm not against anyone using lead tracking software, but it always seem to me when I was in the custom home business that I was only really working on a handful of prospects at any one time, so I found it easier to just write the basic info in my phone book, and this is the form I used.  The form fits standard 3.6 x 6.5 phone book pages.  I printed them on yellow paper and kept them together in my book so they were easy to find, and I just flipped through them several times a week to remind myself of where we were in the design/estimating/sales process.  If the project fell through, I simply removed the page, which meant that my book only had a few active leads to review.  Not very sophisticated, but quite effective.