Writing for a website is different than writing for a hard copy marketing piece in many ways. A few of the things you have to consider are different types of calls to action, cross-linking, and keywords. And as any copywriter knows - there are three letters that loom large over any web copy: SEO.
Updating or creating a new website is a big undertaking for an organization. Even after you take the time to find the right website design agency, you have quite a lot of work ahead of you. Strategy sessions, site architecture, design review and perhaps the biggest mountain of them all: content development.