Web design rant

I lived through the browser wars. I remember "best viewed in..." logos on Web pages. Those days sucked and I never want to go back. So, why oh why, am I still seeing the following in 2007?

• A page coded as 100% valid XHTML Strict (yes, strict!) being told the code is "incorrect" by the code checking software.
• A newly launched library Web site that took piles of cash to develop with an XHTML Transitional DOCTYPE yet the homepage has 267 validation errors.
• A government Web site that looks like this in IE
  
  but like this in Firefox
  

ARGH!!!