The question I'm asking is similar(ish) to this thread:

Except that I'm asking the question:

Do you design web sites that expand to fill the page (whatever display area a user might have on their monitor), or do you prefer to 'lock' your page width (eg. optimised for 800x600 display size).

Is there any right or wrong here, pros and cons? Or should you be flexible and be happy developing using either approach depending on the needs of the site in question?

Looking forward to your comments...