I tend to think of a developer as more of a programmer - but in this context I think they're quite interchangeable.

There are numerous roles involved in creating a website, depending on the size of the business. In larger firms you could find a Web-coordinator, a director of web strategy, web designer, web developer and web master. 'Web Developer' implies that the individual has created the underlying functionality and structure of the site (the database and code to display the required info) but is not responsible for its content nor its day-to-day maintenance.

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Note added at 5 hrs (2010-03-04 12:25:04 GMT)
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If it is the person responsible for day-to-day management you are looking - then that is the 'webmaster'.

Is this too obvious?

"26 Apr 2007 ... disable this feature in the "Advanced" options panel. As a web author, your only recourse is to make your 404 Not Found message longer. ..."
htmlhelp.com/faq/html/all.html -

"A web author's guide to search engines: how to improve your ranking. Introduction: how do search engines work? Part 2: How to make search engines work for ..."
www.essex.ac.uk › wag › searchguide

"22 Feb 2008 ... It is not necessary to manually add a Web Author Email Address at the bottom of your web pages if you are using the Standard BNL Templates. ..."
www.bnl.gov/webstandards/modifiedDate_AuthorEmail.asp -

"In fact, whatever your needs as a Web author, you'll likely find a free service for it on the Web! Please send us E-mail if you're aware of any free ..."
www.thefreesite.com/Webmaster_Freebies/

Another two more possibilites.

Option 1: webmaster
Option 2: website administrator

Source: http://en.wikipedia.org/wiki/Webmaster