The following links will provide you with valuable resources.

Avoiding Fraud
Visa Fraud Control
American Express Fraud & Security
ClearCommerce
Discover Card Fraud Tips
i-Fraud.com
Merchant Fraud Squad
ScamBusters
The National Fraud Center

Logos
Bank card logos for your site or advertising materials.

Select postal and shipping services
Stamps.com:  http://www.stamps.com
UPS Shipping: http://www.ups.com
Federal Express (FedEx): http://www.fedex.com

Raise capital
garage.com:  http://www.garage.com
OffRoad Capital: http://www.offroadcapital.com
PricewaterhouseCoopers:  http://www.pwcmoneytree.com
Venture Capital Resource Library:  http://www.vfinance.com
VentureList.com: http://www.venturelist.com

Subscribe to business publications
American City Publishing:  http://www.bizjournals.com
Business 2.0:  http://www.business2.com
Entrepreneur.com:  http://www.entrepreneur.com
Fast Company:  http://www.fastcompany.com
Forbes:  http://www.forbes.com
Red Herring: http://www.redherring.com
smalloffice.com: http://www.smalloffice.com
Success Magazine:  http://www.successmagazine.com
The Industry Standard: http://www.thestandard.com
Upside Today: http://www.upside.com
Wall Street Journal: http://startup.wsj.com