well i do a lot of professional Development,
And it depends on your HTML, ASP, PHP knowledge.
I use notepad mainly or araneae.
A simple yet powerful text editor for the web. Araneae (pronounced ah-RAN-ee-ay) is a tool that provides only the features necessary to create stunning websites with all the latest web technologies. Araneae will not seize control of your code, leaving its interface astonishingly uncluttered and easy to use. Simply put, Araneae is just what you need.
at
www.araneae.com - it is also completely free.
if your a biginner then the easiest application is not
Microsoft Frontpage but is actually
Net Object Fusion it is a true "What you see is what you get" you place a image on the screen and the program will generate all the code to place it there. it got hundreds of styles.
the next stage is some thing like
Macromedia Dreamweaver MX and
Microsoft Frontpage which i have never used.
To be honest if you want to do professional web development. You are going to have to learn to able create HTML, ASP ,PHP, Etc... In something free and unaidded as Microsoft Notepad or araneae. As companies do not offered have programes such as Microsoft Frontpage or Macromedia Dreamweaver.
The only other one which i know is HotDog Professional, which is free if on some cover CDs or is cheap to buy. it allows you to preview your code as you type it.
it really depends on what you want to spend and do.
Luckystar