How many of you are trying to keep your sites standards compliant?

Do you?

1. For DOCTYPE, use Strict, Loose, or Transitional, or nothing?

http://www.alistapart.com/stories/doctype/

2. Use XHTML1.1, XHTML1.0, HTML4, don't know/don't care?

I've settled on XHTML1.1 strict, which requires strict adherence to the rules (all lower case tags, self closing tags must have />, for example: <br/>, <img src="go.gif" />, etc).

As someone with programming experience, the enforcement of the rules is not a problem as compilers are generally not very forgiving, depending on the programing language...

As a follow up, have you looked at emerging standards like CSS3, HTML 5, and XHTML 2?

Both HTML 5 and XHTML 2 have interesting new features, but are years away from finalization, and implementation by browsers.