MicroMentor helps emerging entrepreneurs grow their businesses through mentoring and advising relationships with experienced peers and business professionals.
iMantri hosts an online, peer-to-peer community for seeking and offering mentoring and coaching.
StartupNation. Free service founded by entrepreneurs for entrepreneurs

Mid-Atlantic Venture Association. Members page has about 125 firms listed.
National Venture Capital Association. National organization for venture capital firms.

Kiva, zip.kiva.org.
Go Big Network, www.gobignetwork.com.
IdeaCrossing, www.ideacrossing.org.
Business Plan Posting, www.businessplanposting.com.
RaiseCapital.com, www.raisecapital.com.
TheFunded.com, www.thefunded.com.
Kickstarter, www.kickstarter.com.
RocketHub, www.RocketHub.com, a launchpad and community for independent artists and entrepreneurs.
Wicked Smart, www.wickedstart.com.
FundingSavvy, www.fundingsavvy.com.
CapLinked, www.caplinked.com.
Quirky, www.quirky.com.