You don’t need a business plan to launch a company. But many entrepreneurs who spell out their goals and how they intend to achieve them say it yields huge benefits. Bplans, from Palo Alto Software Inc., tries to make the process easier by letting visitors peruse more than 500 sample business plans and dozens of marketing plans. Browsing through them is free, but downloading a sample to edit for your own use will run $99.95 for business plans and $179.95 for marketing plans. This site also offers articles, blogs and webinars on a range of topics, and visitors can use calculators for estimating cash flow and other things.