There are a number of tools that we like to use at Izolo.
A number of them help a great deal with understanding what is really going on with web services. Some speed development and others provide the necessary error correction to produce great, international sites.
For validating XHTML:validator.w3.org
For validating CSS: jigsaw.w3.org/css-validator
For checking file sizes and transfer optimality: www.websiteoptimization.com
For international speed testing: www.alertsite.com
Some excellent Firefox extensions:
A window into AJAX requests: Firebug
For filling a page with words before the real content is ready: Lorem Ipsum Generator
A fantastic talk on UI Design from Oscon '06.
Hopefully these help you understand and develop web sites.
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