Couple of online "crowd sourcing" services I would recomment when developing a new project from ground up, on budget..
1) Brand name
http://www.namingforce.com/ will help you find a name for your new product or website or company. It will cost ~£60 for a decent name.
2) Logo
http://www.crowdspring.com/ will let you post your brief, and get a very decent logo for ~£200
3) Beta testers, Products feedbacks
http://uservoice.com/ will let you gather feedbacks from 100s of users for £20
4) Get the crowd to generate leads for you
Came across this very recently, and not tested it. But have had the idea to develop something similar for year, and glad to see that somebody has finally decided to make this type of services available online!
5) Bonus
Promotions, etc you can get for a fiver? (well, £250 at the current $ to £ rate)...