If so, check out this page from BW Online. You'll find numerous articles on a variety of topics - for those looking for advice on getting started, for those targeting investors, and for those who need to improve their plan. Here's a summary of what you'll find:
"Begin with the End in Mind" talks about whether an entrepreneur needs a business plan in the first place. "Before You Write a Business Plan" goes back to some very important basics: testing your ideas and creating your business model.
"The Right Business Plan for the Job" discusses the various forms a business plan can take - from executive summary to the very complete operational business plan. "The Best Business Plan Tools" suggests books, websites, and other tools that are essential for writing a good business plan. "The 10 Biggest Business Plan Mistakes" lists ten areas where entrepreneurs could improve their business plan. "Impress Potential Investors in 12 Steps" suggests twelve tips to deliver an effective presentation to investors.
There's a lot of solid advice here. Enjoy!