Here's a few good articles on the subject
Validation alone is not enough
Beyond Validation and a quote
Quote:
Think of [validation] as a sanity check - just verifying that everything you’ve written accords with the language logic. It’s easy to write some pretty bad code which still validates - using tables for layout, for example, is a poor practice, but you can certainly still make it validate.
Beyond validation there’s a whole world of thought in considering image sizes, color contrasts, typography, navigation methods and semantics which can be the greatest aid to a user or user agent.
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And like the w3 link mreine gave you, the validator is more like a spell-checker. Make sure you don't have a misspelled element/attribute or one you forgot to close.
It's always good to validate.
