Here is a break down, of some of the tasks that are done by a Webmaster to build or maintain a website:

• Building a Web site from scratch, starting with a site map and templates.
• Coding the site, updating existing content and adding new content.
• Improving the site, with new content and features.
• Enhanced navigation, HTML links, Javascript and the use of CSS Style Sheets to enhance Links.
• Creation of artwork, logos, animation, streaming video and Sound.
• HTML, CSS, SSI, SSL, PHP, Ajax, Perl, JavaScript, Java, and MySQL data bases.
• Basic Site Navigation ( checking that all links are up to date and working correctly, this site has around 1700 links. )
• Installing Flash, Java and Javascript coding and have it MS compliant, "click to activate", coding to remove that user action.
• Installation of pre-existing Perl scripts.( Your Server needs a cgi-bin for these, the scripts are usually written in Perl. )
• Installation of pre-existing PHP scripts.
• Backing up the site to CD-ROM and Harddrive.
• Coding pages to be compatible with all or most Browsers.
• Create Special Error docs.
• robot.txt, htaccess, password protecting folders.
• Upload content to server, create folders and files, chmod folders and files to the correct permissions.
• Making sure you spell check every page. lol visitors will let you know if you did not, they keep you on your toes, which is great, I like that feedback.
• Responding to visitors comments and concerns.
• A .com .net .something registered in your name.
• A Server to Host Website.

Some more complex Webmasters Tasks:

• Specially-crafted icons. (such as logos, 3D objects, or characters)
• Mouse-over interactive buttons and similar features.
• Standard GIF animations.
• Flash animation and have it MS compliant, "click to activate", coding to remove that user action.
• Java scripting and have it MS compliant, "click to activate", coding to remove that user action.

Tasks which are time consuming and some need Special Security Features:

• Dealing with Hackers, Spambots and Spammers.
• Setting up and Message Board. ( These are being targeted by Spammers and Spambots with a vengeance )
• Setting up and Securing a Guest book, these are targeted by Spammers and Spambots with a vengeance.
• Chat Rooms, you need a Server with a lot of Bandwidth for this and is very CPU intensive, should be on a special server.
• Setting up and Securing a contact or feedback form, again, any input form is being targeted by Spammers and Spambots.
• Setting up and Securing a Blog with comments turned on. targeted by Spammers and Spambots.
• Protecting email addresses. from Spammers and Spambots.
• Making sure all Scripts are up to date with Security Patches.
• Checking Error and Access Logs.
• Protecting files from Hackers.

Tools that I use to build and maintain the Website:

• Dreamweaver CS3 and Notepad.
• Adobe PhotoShop CS3.
• Adobe Flash CS4.
• My FTP client is CuteFTP Home 8.
• ScriptForest Menu Maker, for my Java Menu, compatible with all Browsers, edit 4 files and upload them to the server, all pages are updated.
• To make my Flash Banners, I use Swish MiniMax 2.
• Remote Hosting Service, I have been using Branzone and I am extremely happy with them, the support is second to none.