<p>When developing a new web based application which version of html should you aim for?</p>

<p>EDIT:</p>

<p>cool I was just attempting to get a feel from others I tend to use XHTML 1.0 Strict in my own work and Transitional when others are involved in the content creation.</p>

<p>I marked the first XHTML 1.0 Transitional post as the 'correct answer' but believe strongly that all the answers given at that point where equally valid.</p>

I'd shoot for XHTML Transitional 1.0. There are still a few nuances out there that don't like XHTML strict, and most editors I've seen now will give you the proper nudges to make sure that things are done right.