As technology continues to develop and impact the way we live, it's also redefining PR agencies' approach to client service.

"Every year, we have to step up our game," says Stacey Johnes, cofounder of entertainment and lifestyle firm Media Tonic. "First it was e-mail. Then it evolved into IM with clients. We [must] provide a timely response whether we're in or out of office, state, or country."

Such communications tools give Johnes a sense of freedom; she says they allow her ...