I have selected these links because I feel they provide answers to many of the questions you will need answers to if you are responsible for new business development.

Marketing Plan

Interactive Business Planner (IBP)
A great free online business plan tool from the Canadian government

Business plan writing
Hints, tips and resources for writing a business plan from the US Small Business Administration (SBA)

Business plan writing
Hints, tips and example business plans from My Own Business

Executive Summary

Executive summary writing
Hints and tips for an executive summary. Entertaining video!

Executive Summary Examples
From a vendor of software that helps you to create business plans. Thank you Sarah Vefghi.

Executive Summary and Related How-Tos
From About.com on Canadian Small Business. Thank you Sarah Vefghi.

Comparison of Good and Bad Executive Summaries
From UniLearning, an Austrailian website dedicated to good writing. Thank you Sarah Vefghi.

Other Useful Resources

Elevator Pitch
Hints and tips for perfecting your elevator pitch

Investor Pitch
Hints and tips for honing your investor pitch

Advisory Boards
Hints and tips on how to structure a Board of Advisors

Advisory Boards
Don't Go It Alone: Create an Advisory Board from Business Week.