It's more than just a web presence- read the fundamentals of providing legal services over the internet, as well as innovative best practices (with a US-slant of course):
From the American Bar Association eLawyering website:
"How can I practice law over the Internet?" This web site will help you find answers to that question.
eLawyering is doing legal work - not just marketing - over the Web. Pioneering practitioners have found dramatic new ways to communicate and collaborate with clients and other lawyers, produce documents, settle disputes, interact with courts, and manage legal knowledge. ELawyering encompasses all the ways in which lawyers can do their work using the Web and associated technologies. Think of lawyering as a "verb" - interview, investigate, counsel, draft, advocate, analyze, negotiate, manage, .. - and there are corresponding Internet-based tools and technologies.
There are exciting initiatives underway now that deserve attention by all lawyers - present and future. While admittedly just a subset of the vast legal technology world, eLawyering and its lawyer-less analogs present fundamental challenges for our profession. There are great dangers, but also great opportunities for attorneys in the coming decade. To be successful in the coming era, lawyers will need to know how to practice over the Web, manage client relationships in cyberspace, and ethically offer "unbundled" services.