I'm part of a small consulting firm, and we do grant writing for nonprofit and public agencies. For the last 15 years we've maintained an e-mail database of people interested in grant opportunities, and we send a weekly e-mail that lists current grant opportunities.
Originally we hired a consultant to create a system in which we add grant opportunities to a private part of seliger.com, and we use a system vended through our web host to send the actual e-mails.
Now we're trying to move to Constant Contact, which appears to be less expensive and better than our web host's system. So we're looking for a developer who has experience in working on these kinds of problems.